The Internet Portal
The Internet is a global system of interconnected computer networks, consisting of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies. The Internet appears to its users as a single worldwide network accessible to the general public. The protocol that makes it possible to use the millions of networks composing the Internet as if they were one network is a special type of packet switching known as IP or The Internet Protocol.
A computer that connects to the Internet can access information from a vast number of servers and other computers. An Internet connection also allows the computer to send information through the network; that information may be saved and ultimately accessed by a variety of servers and other computers. Much of the information widely accessible through use of the Internet consists of the interlinked hypertext documents and other resources of the World Wide Web (WWW). Web users typically send and receive information using a web browser. Other software for interacting with computer networks includes specialized programs for electronic mail, online chat, file transfer and file sharing.
Information is moved around the Internet by packet switching using the standardized Internet Protocol Suite (TCP/IP) which defines how packets are moving in any platform especially the transport layer. The Internet Protocol Suite consists of several layers of protocols. The lowest layer (the link layer) deals with protocols that transmit data over specific technologies, such as Ethernet or Wi-Fi. The highest layer (the application layer) supports specific applications, such as e-mail and file transfer. In between are the Internet layer, which provides for transmitting packets over any conceivable technology, and the transport layer, which provides for various services such as reliable delivery of packets or real-time streaming of packets.
An HTTP cookie
is a parcel of textual information sent by a server
to a World Wide Web browser
and then sent back by the browser each time it accesses that server. HTTP cookies
are used for user authentication, user tracking, and maintaining user-specific information such as site preferences and electronic shopping carts. Cookies have been of concern for Internet privacy
, since they can be used for tracking the browsing of a user. As a result, they have been subject to legislation in various countries such as the United States
, as well as the European Union
. Cookies have also been criticised because the identification of users they provide is not always accurate and because they can be used for network attacks. Some alternatives to cookies exist, but have their own drawbacks. On the other hand, cookies have been subject to a number of misconceptions, mostly based on the erroneous notion that they are computer programs
. Most modern browsers allow users to decide whether to accept cookies, but rejection makes some Web sites
(born July 9, 1971, in Cedar Falls, Iowa
and raised in New Lisbon, Wisconsin
, United States
) is a software engineer and entrepreneur best known as co-author of Mosaic
, the first widely-used web browser
, and co-founder of Netscape Communications Corporation
. He was the chair of Opsware
, a software
company he founded originally as Loudcloud, when it was acquired by Hewlett-Packard
. Netscape's success attracted the attention of Microsoft
, which recognized the web's potential and wanted to put itself at the forefront of the rising Internet revolution. Microsoft licensed the Mosaic source code from Spyglass, Inc.
, an offshoot of the University of Illinois, and turned it into Internet Explorer
. The resulting battle between the two companies became known as the Browser Wars
. Andreessen is an investor in social news website Digg
and serves on the board of Open Media Network
. He is also a cofounder of Ning
, a company which provides a platform for social-networking websites.
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File:Internet map 1024.jpg
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