All about internet Wide area network.

2.  Internet, is a set of decentralized networks.
 The Internet is a massive network of networks, a networking infrastructure.
It connects millions of computers together globally.
 These networks can be private internally, but externally they have a
common point of access to the world.
 WWW(world wide web) is the mostly used service for accessing information
over the medium of the internet. It is an information-sharing model that is
built on top of the Internet.

4.  WAN is an arrangement of various systems, such as, LANs.
 For example, the LANs of home, office, and datacenter can be connected to
each other to make a WAN network.
 A WAN network could be private and on account of this protection only
systems connected to this can get access to this WAN.
 Usually Government, Businesses use this network so they could easily send
information to each other from different Geographical areas.

6.  The main thing in Internet WAN is SCOPE.
 The largest WAN of all is Internet, which has global reach.
 Internet is a worldwide public WAN . But a WAN would probably use the
Internet.
 We can host all the services of the Internet in a private WAN network, but it
will be for a limited public.
 On the other hand the Internet has the global public scope and contains a
larger number of systems interconnected.