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    As we know that the Internet is a computer network that connects hosts and end
                      systems throughout the world. In this chapter, we will learn about the Internet and
                      e-mail service of the Internet in detail.

                      The Internet

                      The  seed  of the  Internet  was  planted  in  1969             Migratory birds navigate with
                      when the Advanced Research Projects Agency                        magnetic fields just as the
                      (ARPA) of the  United  States  Department                       Internet routes data through
                      of Defense began  connecting  computers at                            different networks.

                      different  universities  and  defence  contractors.
                      The  resulting  network  was  called  Advanced
                      Research Projects Agency Network (ARPANET).

                      In the beginning, ARPANET was a large network serving only a handful of users, but
                      it expanded rapidly. Initially, the network included four primary host computers. The
                      Internet acts as a carrier for several different services, each with its own distinct

                      features and purposes. The most commonly used Internet services are: World Wide
                      Web, electronic mail, news, file transfer protocol, chat, instant messaging, online
                      services and peer-to-peer services. January 1, 1983 is considered the official birthday

                      of the Internet. Before this, the computer networks did not have a standard way
                      to communicate with each other. A new communications protocol was established
                      named Transmission Control Protocol/Internet Protocol (TCP/IP). The TCP/IP
                      allows computers to be connected to different networks communicate with each other.

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