Slytherin is one of the four Houses at Hogwarts School of Witchcraft and Wizardry, founded by Salazar Slytherin. Salazar instructed the sorting hat to choose a few particular characteristics he most valued. Such character traits are cunning, resourcefulness, and ambition (during the time period the books and films take place in, this house is mostly of pure-blood pure-blood supremacy, due to his mistrust of Muggle-borns, but this discrimination does not last).