Elves are magical beings, they serve wizards and witches doing domestic tasks. They are very loyal and devoted to their master and they are freed once their master presents them with clothes.
House-elves are powerful, despite their small size, and they don’t need a wand to do magic. A elf can not use magic against their master, he has to use his magic to protect the family that he serves. If they do something without their master's permission they have to punish themselves for their acts.
Dobby was one of the elves in Harry Potter, he used to serve the Malfoy's family but was released after his master Lucius gave him, by mistake, one sock.
After being released, Dobby become a great friend for Harry and helped him in many adventures.
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