Key (disambiguation)

A key is an object used to open a lock.

Key might also mean:
Key, to be a very important part
Key (music), a combination of notes used to write a piece of music
Key, the switches on a computer keyboard that are pressed to enter data into a computer
Key, the levers or buttons on a musical instrument that are pressed to make a sound or note
Key (company), a Japanese visual novel company
Key (cryptography), a piece of information that allows encryption or decryption
Key-value pair (computing), two related data elements
Cay, a type of island, such as the Florida Keys