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A Brand Ambassador (sometimes also called a Corporate Ambassador) is a person who is hired by an organization or company to represent a brand in a positive light and by doing so help to increase brand awareness and sales. The brand ambassador is meant to embody the corporate identity in appearance, demeanor, values and ethics. The key element of brand ambassadors is their ability to use promotional strategies that will strengthen the customer-product-service relationship and influence a large audience to buy and consume more. Predominantly, a brand ambassador is known as a positive spokesperson, an opinion leader or a community influencer, appointed as an internal or external agent to boost product or service sales and create brand awareness. Today, brand ambassador as a term has expanded beyond celebrity branding to self-branding or personal brand management. Professional figures such as good-will and non-profit ambassadors, promotional models, testimonials and brand advocates have formed as an extension of the same concept, taking into account the requirements of every company.
The term brand ambassador loosely refers to a commodity which covers all types of event staff, varying between trade show hosts, in store promotional members and street teams. According to Brain, the job of a brand ambassador was undertaken typically by a celebrity or someone of a well-known presence, who was often paid considerably for their time and effort. Nowadays however, a brand ambassador can be anyone who has knowledge or can identify certain needs a brand is seeking. The fashion industry however, solely rely on celebrity clientele in order to remain brand ambassadors. Furthermore, brand ambassadors are considered to be the key salesperson for a product or service on offer. They must remain well informed when it comes to the brand they are representing, due to their nature of being the go-to person when questions arise from consumers. The brand ambassador's job is to drive results through communication tools either publicly, such as social media, or privately including emails, messaging and further one-to-one channels.
The concept of brands and brand marketing have evolved over decades. Traditionally, consumers were familiar with only a few products that were available in the market. Beginning from the 1870s a number of companies began pushing 'branded products,' which familiarized consumers with more brands. From 1915 through the 1920s, manufacturer brands were established and developed further, which increased companies' reliance on brand advertising and marketing. However, the Great Depression led to a severe drawback in brand progress, as companies were left with few ways to increase revenue and get their business back on track. For the sake of their brand and survival in a hopeless market, companies such as Procter and Gamble, General Foods and Unilever developed the discipline of brand management. The "brand manager system" refers to the type of organizational structure in which brands or products are assigned to managers who are responsible for their performance.
From the early- to mid-1950s to the mid-1960s, more firms moved toward adopting brand managers. The sudden boom in the economy, followed by a growing middle class population and birth rate, increased the demand for products within the market. This led to a steady competition among a number of manufacturers who found it hard to get their products noticed amidst the pre-existing brands. By the year 1967, 84% of large consumer packaged goods manufacturers had brand managers. Brand managers were also being referred to as "product managers" whose sole priority shifted from simply brand building to boosting up the company's sales and profit margin. "The product manager is man of the hour in marketing organizations.... Modern marketing needs the product manager," raved one 1960's article.
Over the course of several years, brand managers continued to exist as a medium that would help boost company revenue. In the 1990s, Marketing UK highlighted that brand managers are a part of an "outdated organizational system" while "the brand manager system has encouraged brand proliferation, which in turn has led to debilitating cannibalization and resource constraints."
From the 1990s to early 2000s, brand management itself evolved as brand asset management. Davis defined Brand Asset Management Strategy as "a balanced investment approach for building the meaning of the brand, communicating it internally and externally, and leveraging it to increase brand profitability, brand asset value, and brand returns over time."
Campus ambassadors (also known as "brand representatives" and "brand ambassadors") are college students who spread the word about the company that they represent. The goal of campus ambassadors is to help the company with marketing programs on campus to target the college demographic. This can be achieved by throwing events, hosting workshops, and utilizing social media to promote the brand or company. 
Using celebrities as brand ambassadors is hardly a new concept. Creswell highlights that, "film stars in the 1940s posed for cigarette companies, and Bob Hope pitched American Express in the late 1950s. Joe Namath slipped into Hanes pantyhose in the 1970s, and Bill Cosby jiggled for Jell-O for three decades. Sports icons like Michael Jordan and Tiger Woods elevated the practice, often scoring more in endorsement and licensing dollars than from their actual sports earnings."
Large corporations realized that the overall image of a brand ambassador within society is an integral element to attract consumer attention. As a result, there was a substantial increase in celebrities as brand ambassadors, it was assumed that integrating a celebrity to a brand would increase chances of it being sold, which made companies value the business ideal of a 'brand ambassador.' The case study of the famous watch brand Omega, illustrates that the brand faced a severe crash in sales in the 1970s due to the Japanese Quartz phenomenon. Michault believes that, "by the time Omega had seen the error of its ways, the damage to its reputation was done. From the 1970s to the end of the 1990s, it was no longer seen as a luxury watch company." It was then for the first time in 1995, that Ms. Cindy Crawford became the new face of Omega, introducing the age of the celebrity brand ambassador. The man behind this marketing ploy was believed to be Jean-Claude Biver, whose strategy changed the entire landscape for branding in the future. During this time, many companies expanded their annual budgets to meet the financial liabilities that came with celebrity endorsing.
Celebrities are popular and followed by many people so it makes sense that marketers benefit from using them in order to get their message across. A celebrity can capture consumers' attention link the brand with their own personal image and associate their positive attributes with those of the product concerned. However, in some cases celebrity branding could go terribly off the script and affect product revenue.For example, recent doping charges on Lance Armstrong cost him $30 million in endorsements. Celebrity, world-famous athlete, he stepped down as the chairman of Livestrong. On the other hand, Nike sponsor to the athlete and U.S cycling team stated in a press release,"due to the seemingly insurmountable evidence that Lance Armstrong participated in doping and misled Nike for more than a decade, it is with great sadness that we have terminated our contract with him."
Despite celebrity endorsements known to play a beneficial part in gaining awareness for a selected brand, challenges as well as further risks may arise. This is effective when controversy or ill-behaviour is associated with the selected celebrity, later forming a negative impact towards the endorsement and brand themselves.
According to Giriharidas,"the personal-branding field or self-brand traces its origins to the 1997 essay "The Brand Called You," by the management expert Tom Peters." Contemporary theories of branding suggest that brand ambassadors do not need to have a formal relationship with a company in order to promote its products/services. In particular the Web 2.0 allows all individuals to choose a brand and come up with their own strategies to represent it. Biro believes that "everyone owns their own personal brand. Companies and leadership must see the value of this concept for a successful social workplace recipe. If a brand ambassador chooses to represent the company and/or its brands, the individual should do so in a transparent way."  Self-branding is an effective way to help new businesses save the hassle of hiring brand ambassadors, training them and then realizing they are not good enough for the company. In addition, it is an effective tool in order to target a niche audience and allows one to take sole control of their own brand representation. On the other hand, branding one's own product/service creates an instant connection with the audience and helps the brand stand out in comparison to other known brands that use popular celebrities or hire brand ambassadors. Reis propagates her branding mantra, "think about other people. Think about the impressions you are making on friends, neighbors, business associates. Think about your brand." Creating a personal branding strategy is an effective way to attract audience attention. She gives the example of Marissa Mayer, CEO Yahoo. According to Laura Ries, Marissa is successful because she has what most people don't - "she has a brand."
Self-branding also known as personal branding is a way in which an individual may promote or build their reputation. Wheeler also highlights how sending an email can contribute towards an individuals personal brand and how personal branding has become important over the past few years due to the increase of self-employees individuals. The importance of personal branding increasingly rises due to modern audiences often trusting people as opposed to corporations. This falls down to the fact that audience members tend to believe that corporate organizations only have the final sales of product in mind as opposed to the publics interest instead. Furthermore, a personal brand is also a clear indication of who you are and what best features you can offer, showing employees or clients what they could expect. The promotion of a personal brand is also essential in order to create and build a successful network of contacts, which in its self can lead to more business and future clients as well.
A Goodwill ambassador is an honorary title and often linked with non-profit related causes. Their primary function is to help non-profit organizations spread their message across. Predominantly, goodwill ambassadors are celebrity advocates or known personalities, who use their fame and talent to get funding, donations, encourage volunteers to participate and raise awareness towards the organization's cause. In the past many organizations such as UNESCO have endorsed their cause through UNESCO Goodwill Ambassador. These celebrities or known personalities are picked according to the organizations' intended audience and if fully invested in the cause they are promoting they can greatly influence the process of persuading others. Goodwill ambassadors make widely publicized visits to the world's most troubled regions, and make appeals on behalf of their people and the organization. For example, the United Nations Goodwill Ambassadors include famous celebrities like Angelina Jolie for UNHCR, David Beckham, Shakira for UNICEF, Christina Aguilera for WFP and Nicole Kidman for UN Women.
A promotional model exists in the form of a spokesmodel, trade show model and convention model. Each of these models carry out functions beyond representation of the company in a positive light. The main difference between a brand ambassador and a promotional model is in the way they represent the product/service. In many cases, unlike brand ambassadors, a promotional model may give the audience a live experience that reflects the product or service being branded. They may be required to promote the brand at simply one to many occasions while a brand ambassador is often tied down to one particular brand through the means of a contract over a period of time.Promotional models are required to be physically present at the venue as per the requirements of the marketing campaign, however brand ambassadors are most often referred to as the face of the brand. Promotional models are most often found in trade shows exhibits (in some cases referred to as "booth babes"), conventions and in print, digital or selected advertisements for the brand from time to time. The employment of so-called "booth babe" models at trade show exhibits and conventions has been criticised by some.
As previously stated, promotional models are said to be different as opposed to brand ambassadors, however in some ways, they feature similar attributes. There's a saying which states how all promotional models are brand ambassadors, yet not all brand ambassadors are promotional models. This is due to the fact that promotional models are seen as a specific type of brand ambassadors. Furthermore, the working conditions of a promotional model varies depending on many factors, these can include the company, target audience, venue, etc. Despite variations of promotional modeling work, most assignments involve handing out some form of literature or product samples.
Testimonial is simply a way of conveying assurance, in this case assurance is provided by the testimonial of the company or product/service in question in a written or spoken manner. A testimonial does not advertise the product freely unlike the role of the brand ambassador. A brand ambassador performs the function of a testimonial but a testimonial is not a brand ambassador. By simply providing a testimonial for a product/service, one need not be an ambassador for the same. For example, a customer can be a testimonial, since a testimony could be formal or informal "word of mouth" advocating the positive facets of the product. On the other hand, a consumer could not always be brand ambassador, since the latter is more commercial and is often considered as a position bound by monetary and professional liabilities. To a certain degree, celebrity endorsements provide testimonials for the product/service they are marketing. However, with the advent of the digital age testimonials have reached an all-time high. A large number of websites feature a "go to" tab where one can put down reviews or testimonials for the product/service. This has led to an increase in fake reviews, where companies have chosen to pay people to get their positive feedback. According to a study conducted by the research firm Gartner, "one in seven reviews/testimonials posted online by the end of next year is likely to be false. Other estimates put the number as high as one in three."
Fuggetta highlights that a brand advocate is a marketing term for "highly satisfied customers and others who go out of their way to actively promote the products they love and care about, they are a different breed altogether. " Further, he states that they are 50% more influential than an average customer. Often a positive experience with a brand, successful customer-service relationship motivates a brand advocate to express their positive feelings towards a brand. Traditionally, a brand advocate would sing praises of a brand and this would circulate through 'word of mouth' or other similar channels. However, in the digital age social media tools have allowed brand advocates to express themselves on forums such as Twitter, Facebook by 'tweeting' about a brand experience or 'liking' the brand itself. Rubin believes, "when customers seek you out via social, they're looking for an opportunity to build an emotional connection. So give it to them."