Noob or n00b, is a slang term for a novice or newcomer, or somebody inexperienced in any activity. Contemporary use can particularly refer to a beginner or new user of computers, often concerning Internet activity, such as online gamin. It can have derogatory connotations, but is also often used for descriptive purposes only, without a value judgment.
The term's origin is uncertain. Earliest uses probably date to late twentieth century U.S. military jargon, though possible precursor terms are much earlier. However its etymology is uncertain. It may derive from "newie", which is attested in U.S. and Australian sources of the 1850s and means a neophyte in a place or situation.
In the 1960s–1970s the term "newbie" had a limited usage among U.S. troops in the Vietnam War as a slang term for a new man in a unit. The term is believed to have entered online usage by 1981.Two related terms are "newb", a beginner who is willing to learn; and "noob" (often spelt "n00b" or "nub"), a derogatory name. "noob" was among candidates for the one-millionth English word selection by the Global Language Monitor.