why are elves slaves in harry potter

The elves in the Harry Potter universe are not considered slaves. They are creatures with their own intelligence and culture, but they are bound to serve wizards as a result of a magical contract. This arrangement is not one-sided, as the elves have their own benefits, such as food and shelter. The relationship between wizards and elves is complex and not completely understood, but it is clear that both parties have their own roles and responsibilities.