A server is a powerful computer or system that provides data, resources, services, or programs to other computers, known as clients, over a network. Servers can manage a variety of functions, such as hosting websites, handling emails, storing files, or running applications. They are essential in both small business environments and large-scale enterprise networks. Servers operate on specialized hardware and software designed to handle multiple requests simultaneously, ensuring reliability and performance. They can be dedicated solely to one task or shared among different services, making them a crucial component of modern computing infrastructure.