Why is the internet a large network?

This is actually a great question. Everyone has a Local Area Network (LAN). This could be as small as one computer plugged into a router in your house to as large as an office building. There is then a Wide Area Network (WAN) which connects several LANs together via a router. The WANs are then connected to each other via more routers. That is what an ISP is, a collection of routers with routes to the various networks all across the internet. All these interconnects form a web, hence the name the World Wide Web. *trivia* The Internet and the World Wide Web are actually two separate entities. The World Wide Web sits on top of the internet. (Internet is physical/link layer, WWW is protocol/application layer)