Networking involves connecting computers together through shared mediums like LANs and WANs. LANs connect computers within an area like a building while WANs connect multiple LANs that are geographically separate using services like phone lines. The Internet is a worldwide system of linked networks that facilitates communication services for millions of users through features like email and the World Wide Web. An intranet is a private network within an organization that provides internal access to information for employees using Internet-like tools.