A CDE Definition
(user IDentification) See username.
The name people use to identify themselves when logging into a computer system or online service. In most situations, both a username (user ID) and password are required.
In an Internet email address, the username is the left part before the @ sign. For example, KARENB is the username in email@example.com. AOL calls a username a "screen name."
A Username Can Be an Email Address
For some sites, a person's email address can be used instead of making up a name. However, sometimes, a username must be the email address (see below).
Username or Email Address?
Before/After Your Search Term
Terms By Topic
Click any of the following categories for a list of fundamental terms.