A bonnet is a type of headwear that is typically worn by women, babies, or children. It is often made of cloth and covers the head, neck, and sometimes the shoulders. Bonnets were popular in the 18th and 19th centuries and have since declined in popularity, but are still used in some religious and cultural contexts. In a more specific context, "bonnet" can also refer to the removable cover or hood of a car that protects the engine.