This document discusses different types of computer networks. It defines a computer network as when two electrical devices connect for data communication. There are four main types discussed: storage area networks (SANs) which provide block-level data storage access; personal area networks (PANs) which connect devices around an individual; home area networks (HANs) which allow file and resource sharing between multiple home computers; and campus area networks (CANs) which interconnect local area networks within a university or campus.