What is a server?

A server is a computer that provides a service, typically to clients. This is a fundamental aspect of network architecture, where servers are designed to handle requests and deliver resources or services to other machines (clients) over a network. Servers can host applications, manage databases, store files, and provide various functionalities such as email, web hosting, and printing services, depending on their configuration and purpose.

For example, in a web hosting environment, a server listens for incoming requests from clients (like browsers) and delivers the requested web pages. In the case of email services, a mail server processes and routes email communication among users.

The other options represent different types of computing systems or devices that do not fulfill the definition of a server. A personal computer is typically used for individual tasks and does not serve the same role as a server in a network infrastructure. A device for storing data only does not encompass the broader functionalities of a server, as it lacks the capability to provide services. Network hardware, while it can include servers, typically refers to devices like routers or switches that manage network traffic rather than providing services directly to users.