The internet a globally connected network system that uses TCP/IP to transmit data via various types of media. Internet is the global system of networks that use the Internet protocol suite to link devices worldwide.
It is a network of networks that consists of private, public, academic, business and government networks. All of local to global scope, linked by a broad array of electronic, wireless and optical networking technologies.
The terms internet and World Wide Web (WWW) often used interchangeably. But they are not exactly the same thing. The internet refers to the global communication system, including hardware and infrastructure, while the web is one of the services communicated over the internet.