A user in computing context is one who uses a computer system. Users may need to identify themselves for the purposes of accounting, security, logging and resource management. In order to identify oneself, a user has an account (a user account) and a username, and in most cases also a password (see below). Users employ the user interface to access systems, and the process of identification is often referred to as log in.

Users are also widely characterized as the class of people that uses a system without complete technical expertise required to fully understand the system. In most hacker-related contexts, they are also called real users. See also End-user (computer science).

A computer user is similar to the user in telecommunications, but with slight semantic differences. The difference is comparable to the difference between end-users and consumers in economics.

For instance, one can be a user of (and have an account on) a computer system, a computer network or have an e-mail account.