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 A computer network connects two or more devices, such as computers, printers, and servers, to share data, resources, and services using physical cables or wireless signals. These networks enable communication, collaboration, and resource sharing, ranging from small local area networks (LANs) to the expansive global Internet. Key components include nodes (devices like computers and printers), links (cables or Wi-Fi), networking devices (routers and switches), and protocols (rules for data exchange). How Computer Networks Work 1. Interconnection: Devices are connected through physical cables (like Ethernet or fiber optic) or wireless technologies (like Wi-Fi). 2. Communication: Once connected, these devices use agreed-upon rules, called communication protocols (like TCP/IP), to send and receive data in the form of packets. 3. Data Exchange: Data is transferred between devices, allowing users to send messages, share files, and access applications or hardware. Key Components of a Network Nodes: Any device in the network that can send, receive, or forward data, such as computers, servers, and printers. Links/Transmission Media: The physical or wireless pathway for data, including Ethernet cables, optical fibers, or radio signals. Networking Devices: Hardware that manages and supports network functions, such as routers, switches, and access points. Communication Protocols: Sets of rules that govern how devices communicate over the network. Types of Computer Networks Networks vary in their scale and coverage: Local Area Network (LAN): A network covering a small area, such as a home, office, or building. Wide Area Network (WAN): A network spanning a large geographical area, connecting multiple LANs, with the Internet being the most prominent example. Purpose and Benefits Resource Sharing: Allows multiple devices to access shared resources like printers, reducing the need for duplicate hardware. Data Sharing: Enables efficient exchange of files and data between users and applications. Communication: Supports various communication methods, including email, instant messaging, and video calls. Centralized Data Management: Facilitates the storage, management, and backup of data in central or distributed locations.