the Boston Celtics are my favorite basketball team, The Celtics compete in the National Basketball Association (NBA) as a member of the league's Eastern Conference Atlantic Division
I don't know much about them, I don't follow basketball. What else can you tell me about them?
they where founded 1946 as one of the original eight NBA teams to survive the league's first decade
Oh so they have been around for a long time.
they have,  The Celtics play their home games at the TD Garden
I imagine they would have to be very popular.
they are, The franchise is the most successful in NBA history
I had no idea! I would never have guessed they were so succesful and popular