This document provides an introduction to networking, including definitions, types, and components. It defines a network as consisting of two or more connected entities that can share resources and communicate. Networks are used to share information and hardware/software, enhance communication, and enable centralized administration. There are several ways to classify networks, including by transmission media (wired vs wireless), size (LAN, MAN, WAN), management structure (peer-to-peer, client-server), and topology (bus, star, ring). The document discusses these classifications in detail and provides examples of each type of network.