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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  when  the  Advanced  Research  Projects
                 Agency (ARPA) of the United States Department of Defense began connecting computers at
                 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 connected to different networks
                 communicate with each other.




























                 World Wide Web

                 The World Wide Web (WWW) is a large information system where you can surf and get
                 information. It consists of several public and private websites which may be interlinked and
                 accessible over the Internet worldwide. WWW is also known as Web. Many people believe
                 that the World Wide Web and the Internet are the same thing, but this is not correct. In fact,
                 these are two different things. The Web is a service (a system for accessing information)

                 that is supported by the Internet, a system of interconnected networks.



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