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A username, also known as a user ID or login name, refers to a unique identifier chosen by an individual or system administrator to represent a user in a computer system, online service, or application. Usernames are typically used in conjunction with passwords or other authentication methods to grant access to user accounts. They are used to distinguish one user from another and are essential for user authentication and authorization.

It’s common for a username to be a short version of a user’s first and last name. For example, ‘site’ may be a username created by combining the first four letters of an individual’s last name or alias with the first letter of the first name. Usernames play a significant role in maintaining personal files and settings on the same computer as an online service. For instance, when a user logs into a new website, they may maintain their identity by using the same username. To log in to their email account, you must know their username and password. A login is a username and password combination.