A keyhole is a small opening in a door or lock that allows a key to be inserted for unlocking. It is typically shaped like a narrow slot or oval, designed to fit the specific shape of a key. Keyholes are essential components of traditional locks, providing security by restricting access to a space. In addition to their practical use, keyholes have also become symbolic in literature and art, often representing secrecy or hidden knowledge. The act of peering through a keyhole can evoke curiosity, suggesting that there is something valuable or intriguing just out of reach, much like the concept of curiosity itself.