Internet plan: The Internet has revolutionized the computer and communications

Why were the Internet and the World Wide Web invented?
Source: SPD Net/Flickr
In 1968, Defense Advanced Research Projects Agency (DARPA) came in agreement with BBN, a research and development company to develop the ARPANET. Its initial purpose was to link computers at Pentagon-funded research institutions over telephone lines.
The ARPANET was the end-product of developments spurred by Cold War military attempts to develop an early-warning system to detect surprise nuclear attacks against the United States.
Military commanders wanted a computer communications system that had no central core, headquarters or base of operations that could be destroyed or interrupted by an attack. An earlier system, called SAGE (Semi-Automatic Ground Environment) had been developed which used computers to track incoming enemy aircraft and to coordinate military response. 
In 1962, Licklider joined ARPA. He spent only two years there, but his work helped to demilitarize the agency. He emphasised interactive computing and the notion that humans teamed with computers could create a better world.
In 1966, Robert Taylor became director of the project that would lead to ARPANET. Taylor had access to three teletype terminals, hooked up to time-sharing mainframe computers at Systems Development Corp. in Santa Monica, at UC Berkeley’s Genie Project, and at MIT’s Compatible Time-Sharing System project. He was able to watch local users connect through these mainframes and realized that people were using them to exchange messages and share files, and that interactive communities were forming around the machines.
Taylor also realized that it would be more efficient if there were a single computer-language protocol that could allow any terminal to communicate with any other terminal. It was these insights that led Taylor to secure funding for the development of ARPANET.
Fathers of the Internet Source: Mike Lee/Flickr
Difference between WWW and the Internet
The key difference between the internet and the world wide web is that the former is the hardware part that incorporates servers, computers, devices, and other physical components of a wired or wireless internet connection whereas, the latter is a software-based virtual system, used to access the internet. 
Internet Protocol (IP) is a set of rules that dictates how data should be delivered over the internet. This works in conjunction with the transmission control protocol (TCP), which divides traffic into packets for efficient transport through the Internet. In contrast, Hypertext Transfer Protocol (HTTP) is the protocol used to transfer data over the web. It defines commands and services used for transmitting webpage data.