Network 

A Network is a group of computer systems and devices that are linked together through communication channel, to make communication easier.

There are three types of networks:

-LAN(Local Area Network)

-MAN(Metropolitan Area Network)

-WAN(Wide Area Network)

World Wide Web(WWW)

World Wide Web is an information space where documents and other web resources are identified, and it’s interlinked by hypertext links(HTML), and accessible via the Internet(HTTP).

https://en.m.wikipedia.org/wiki/World_Wide_Web