The Boston Celtics are an American professional basketball team based in Boston. The Celtics compete in the National Basketball Association (NBA) as a member of the Atlantic Division of the Eastern Conference. Founded in 1946 as one of the league's original eight teams, the Celtics play their home games at TD Garden, which is also the home of the National Hockey League's Boston Bruins. The Celtics are regarded as one of the most successful teams in NBA history and are tied with the Los Angeles Lakers for the most NBA championships with 17. The Celtics currently hold the record for the most recorded wins of any NBA team.

Basketball is a team sport in which two teams, most commonly of five players each, opposing one another on a rectangular court, compete with the primary objective of shooting a basketball through the defender's hoop, while preventing the opposing team from shooting through their own hoop. A field goal is worth two points, unless made from behind the three-point line, when it is worth three. After a foul, timed play stops and the player fouled or designated to shoot a technical foul is given one, two or three one-point free throws. The team with the most points at the end of the game wins, but if regulation play expires with the score tied, an additional period of play (overtime) is mandated.