This document provides an introduction to computer networking, including definitions of key terms and components. It describes a computer network as a group of two or more computers linked together through various connection mediums like cables and wireless adapters to share common resources. The document outlines different types of networks including local area networks (LANs) within limited areas, and wide area networks (WANs) that are combinations of multiple LANs, with the best example being the Internet. It also defines important network components like nodes, network interface controllers, media access control addresses, servers, clients, media converters, repeaters, hubs, switches, routers, firewalls, and channel service units/data service units that connect LANs to W