A network is a collection of computers, servers, devices, or other nodes interconnected by communication links for the purpose of sharing resources, exchanging data, and communicating with each other. These communication links can include wired connections (such as Ethernet cables or fiber optics) or wireless connections (such as Wi-Fi or cellular networks).
Networks can vary in size and complexity, ranging from small, localized networks within a single building (e.g., a home or office network) to vast, global networks like the internet. They can also be classified based on their geographical scope:
Local Area Network (LAN): A LAN typically covers a small geographic area, such as a single building, office, or campus. It allows devices within the LAN to communicate with each other directly at high speeds.
Metropolitan Area Network (MAN): A MAN spans a larger geographic area than a LAN, such as a city or a metropolitan area. It connects multiple LANs and may utilize technologies like fiber optics or wireless connections.
Wide Area Network (WAN): A WAN covers a much larger geographic area, such as multiple cities, countries, or even continents. It connects multiple LANs and MANs over long distances using various technologies like leased lines, satellites, or the internet itself.
Networks can also be categorized based on their use or purpose, such as public networks (accessible to anyone) or private networks (restricted to authorized users), or by the protocols they use to transmit data, such as Ethernet, TCP/IP, or ATM.
Overall, networks play a crucial role in modern computing, enabling communication, collaboration, and resource sharing among devices and users across the globe.