Internet is defined as an Information super Highway, to access information over the web. However, It can be defined in many ways as follows:
• Internet is a world-wide global system of interconnected computer networks.
• Internet uses the standard Internet Protocol (TCP/IP).
• Every computer in internet is identified by a unique IP address.
• IP Address is a unique set of numbers (such as 110.22.33.114) which identifies a computer location.
• A special computer DNS (Domain Name Server) is used to give name to the IP Address so that user can locate a computer by a name.
• For example, a DNS server will resolve a name http://www.tutorialspoint.com to a particular IP address to uniquely identify the computer on which this website is hosted.
• Internet is accessible to every user all over the world.
Evolution
The concept of Internet was originated in 1969 and has undergone several technological & Infrastructural changes as discussed below:
• The origin of Internet devised from the concept of Advanced Research Project Agency Network (ARPANET).
• ARPANET was developed by United States Department of Defense.
• Basic purpose of ARPANET was to provide communication among the various bodies of government.
• Initially, there were only four nodes, formally called Hosts.
• In 1972, the ARPANET spread over the globe with 23 nodes located at different countries and thus became known as Internet.
• By the time, with invention of new technologies such as TCP/IP protocols, DNS, WWW, browsers, scripting languages etc.,Internet provided a medium to publish and access information over the web.
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