A server is a computer system or program that provides resources, data, services, or programs to other computers, commonly referred to as clients, over a network. Servers manage, store, and process data, and can host websites, applications, or databases. They operate continuously, responding to requests from clients and facilitating communication within networks, including local area networks (LANs) and the internet. Servers are essential for modern computing environments, being fundamental in providing central management of resources and enabling remote access and sharing.