House-elves are magical creatures in the Harry Potter series, known for their small stature and large ears. They possess powerful magic but are bound to serve wizarding families, often performing household chores and tasks without pay. House-elves are deeply loyal to their masters and can only be freed if given clothes. These creatures have unique abilities, such as teleportation and the power to perform complex spells without a wand. Notable house-elves include Dobby, who seeks freedom and equality for his kind, and Kreacher, who serves the Black family. House-elves play significant roles in the series, highlighting themes of servitude and freedom.