A name chosen or assigned to identify a user on a computer system, website, or app. It is often used together with a password to log in.
From 'user' + 'name', formed in the late 1900s with the rise of personal computing and the internet. It follows earlier technical terms like 'user ID'.
A username is like a digital mask—you can keep it close to your real identity or make it completely invented. For many people, a username becomes a long-term online identity, sometimes more stable than offline nicknames.
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