The term 'Boston Team, in brief' can be summarized as the CELTS, which is a five-letter acronym for the Boston Celtics. The Boston Celtics are an American professional basketball team based in Boston, Massachusetts. They compete in the National Basketball Association (NBA) as a member of the league's Eastern Conference Atlantic Division. Founded in 1946, the Celtics are one of the most successful and storied franchises in NBA history, having won 17 NBA championships, the most of any NBA franchise.