Heels most commonly refers to high-heeled shoes, a type of footwear that raises the heel of the wearer's foot significantly higher than the toes.
Other meanings of heels include:
1. The back part of the foot below the ankle
2. In wrestling, a villainous character (often called a "heel")
3. The end of a loaf of bread
4. In sailing, the leaning of a ship to one side
5. Slang for someone who is untrustworthy or disloyal