The term 'LOCK' (keyboard key) can be summarized as a four-letter word, 'CAPS'. The LOCK key is a key on the keyboard of a computer that is used to switch between lowercase and uppercase letters. When the LOCK key is pressed, all letters typed will be in uppercase until the LOCK key is pressed again. This key is especially useful for typing passwords or other sensitive information, as it allows the user to quickly switch between upper and lowercase letters without having to manually switch each letter.