You might belong in Gryffindor,
Where dwell the brave at heart,
Their daring, nerve, and chivalry
Set Gryffindor apart;
- The Sorting Hat
One of the four houses of Hogwarts, Gryffindor is the house with Harry Potter, Ron Weasley, Fred Weasley, George Weasley, Hermione Granger, Oliver Wood, Neville Longbottom and some others who's full names I don't remember. (There are several hundred students per house, I believe.) It was also the house of Albus Dumbledore and Mr. and Mrs. Weasley.
The Harry Potter Project