Internet
An internet is a worldwide system of interconnected computer networks. The Internet is product of the convergence of media, computers, and telecommunications. Origin of Internet can be traced to the creation of ARPANET under U.S. Department of Defense in 1969. From its origins in a nonindustrial, non corporate environment and in a purely scientific culture, it has quickly diffused into the world of commerce.
Technological Features
Technological Internet depends on its principal communication tools, the Transmission Control Protocol (TCP) and the Internet Protocol (IP). They are referred to frequently as TCP/IP.
A protocol is an agreed-upon set of conventions that defines the rules of communication.
Function of TCP :
TCP breaks down and reassembles packets,
Function of IP :
IP is responsible for ensuring that the packets are sent to the right destination.
How email works
In E-mail messages arrive at the mail server (similar to the local post office) from a remote personal computer connected by a modem. From the server, the messages pass through a router, a special-purpose computer ensuring that each message is sent to its correct destination. A message may pass through several networks to reach its destination. Each network has its own router that determines how best to move the message closer to its destination, taking into account the traffic on the network. A message passes from one network to the next, until it arrives at the destination network, from where it can be sent to the recipient, who has a mailbox on that network.
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