"Pure-Blood" refers to individuals in the Harry Potter series who come from families with no magical ancestry outside of wizards. This term is often associated with a sense of superiority among some characters, particularly those in the Slytherin house, who believe that being a Pure-Blood makes them more powerful or prestigious. In the wizarding world, Pure-Blood families often hold traditional views and may look down upon Muggle-borns (wizards born to non-magical parents) and Half-Bloods (wizards with mixed magical and non-magical heritage). This belief in blood purity can lead to discrimination and conflict within the magical community.