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. atlast internet accessible to the general public.
is a web browser
and Internet suite
developed by the Opera Software
company. Opera handles common Internet-related tasks such as displaying web sites, sending and receiving e-mail
messages, managing contacts, IRC online chatting
, downloading files via BitTorrent
, and reading web feeds
. Opera is offered free of charge for personal computers
and mobile phones
, but for other devices it must be paid for. Features of Opera include high performance, tabbed browsing
, page zooming
, mouse gestures
, and an integrated download manager
. Its security features include built-in phishing
protection, strong encryption when browsing secure web sites, and the ability to delete private data such as cookies
and browsing history by clicking a button. Opera runs on a variety of personal computer operating systems
, including Microsoft Windows
, Mac OS X
, and Solaris
. Although evaluations of Opera have been largely positive, Opera has had limited success on personal computers. It is currently the fourth most widely used web browser for personal computers, behind Internet Explorer
, Mozilla Firefox
, and Safari
. Opera has a stronger market share, however, on mobile devices such as mobile phones
, and personal digital assistants
Voice over Internet Protocol (VoIP) is a protocol optimized for the transmission of voice through the Internet or other packet switched networks. VoIP is often used abstractly to refer to the actual transmission of voice (rather than the protocol implementing it). VoIP is also known as IP Telephony, Internet telephony, Broadband telephony, Broadband Phone and Voice over Broadband. "VoIP" is pronounced voyp.
Wikinews Internet portal
Template:/box-header Main project: WikiProject Internet
Related WikiProjects: Blogging • Websites • Early Web History • Internet culture
Leonard Kleinrock (born June 13, 1934 in New York) is a computer scientist, and a professor of computer science at UCLA, who made several important contributions to the field of computer networking, in particular to the theoretical side of computer networking. He also played an important role in the development of the ARPANET at UCLA. His most well-known and significant work is his early work on queueing theory, which has applications in many fields, among them as a key mathematical background to packet switching, the basic technology behind the Internet. His initial contribution to this field was his doctoral thesis in 1962, published in book form in 1964; he later published several of the standard works on the subject. His theoretical work on hierarchical routing, done in the late 1970s with his then-student Farouk Kamoun, is now critical to the operation of today's world-wide Internet.