Many people confuse LAN with the INTERNET.
LAN (Local Area Network) is a connection of local computers in an office or within a private area where people can share files and connect to printers and other devices. One of the important aspects of LAN is that it is totally private and used within the locality only.
But the INTERNET is as we all know is totally public. It is also called as WAN (Wide Area Network).It connects millions and millions of computers and it is totally public to all. However, LAN can be used to connect to the Internet as well.