The Internet (portmanteau of interconnected network) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to link devices worldwide. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries a vast range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and file sharing.
The origins of the Internet date back to research commissioned by the United States Department of Defense in the 1960s to build robust, fault-tolerant communication with computer networks. The primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1980s. The funding of the National Science Foundation Network as a new backbone in the 1980s, as well as private funding for other commercial extensions, led to worldwide participation in the development of new networking technologies, and the merger of many networks. The linking of commercial networks and enterprises by the early 1990s marked the beginning of the transition to the modern Internet, and generated a sustained exponential growth as generations of institutional, personal, and mobile computers were connected to the network. Although the Internet was widely used by academia in the 1980s, commercialization incorporated its services and technologies into virtually every aspect of modern life.
Most traditional communication media, including telephony, radio, television, paper mail and newspapers are reshaped, redefined, or even bypassed by the Internet, giving birth to new services such as email, Internet telephony, Internet television, online music, digital newspapers, and video streaming websites. Newspaper, book, and other print publishing are adapting to website technology, or are reshaped into blogging, web feeds and online news aggregators. The Internet has enabled and accelerated new forms of personal interactions through instant messaging, Internet forums, and social networking. Online shopping has grown exponentially both for major retailers and small businesses and entrepreneurs, as it enables firms to extend their "brick and mortar" presence to serve a larger market or even sell goods and services entirely online. Business-to-business and financial services on the Internet affect supply chains across entire industries.
The Internet has no single centralized governance in either technological implementation or policies for access and usage; each constituent network sets its own policies. The overreaching definitions of the two principal name spaces in the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are directed by a maintainer organization, the Internet Corporation for Assigned Names and Numbers (ICANN). The technical underpinning and standardization of the core protocols is an activity of the Internet Engineering Task Force (IETF), a non-profit organization of loosely affiliated international participants that anyone may associate with by contributing technical expertise. In November 2006, the Internet was included on USA Today's list of New Seven Wonders.
is a web browser
project descended from the Mozilla application suite
, managed by the Mozilla Corporation
. Firefox had 16.01% of the recorded market share
in Web browsers as of November 2007, making it the second-most-popular browser in current use worldwide. Firefox uses the open-source Gecko layout engine
, which implements current Web standards
plus a few features which are intended to anticipate likely additions to the standards. Firefox includes tabbed browsing
, a spell checker
, incremental find
, live bookmarking
, a download manager
, and a search system that includes Google
. Functions can be added through more than 2,000 add-ons
created by third party developers
; the most popular include FoxyTunes
(controls music players), Adblock Plus
(ad blocker), StumbleUpon
(website discovery), DownThemAll!
(download functions) and Web Developer
(web tools). Firefox runs on various versions of Microsoft Windows
, Mac OS X
. Its current stable release is version 220.127.116.11, released on 30 November 2007. Firefox's source code
is under the terms of the Mozilla tri-license
as free and open source software
A partial map of the internet, rendered based on ping delay.