A computer network consists of two or more autonomous computers that are linked in order to share programs or software, data, hardware, messages and other resources.
The Internet is the physical network of computers all over the world. The World Wide Web is a virtual network of web sites connected by hyperlinks (or “links”). Web sites are stored on servers on the internet, so the World Wide Web is a part of the Internet.
In 1969, the U.S. Department of Defense, approved a project named ARPANET (Advanced R search Projects Agency NETwork). In 1970, NSF created a common network called CSNET. A more speedy network NSFnet was built. In 1995, a new name was given to the collection of all networks and was called Internet