1
O
Show expanded hints
- This is used to keep something secure.
- It can protect doors, boxes, gates, and other belongings.
- Different versions use mechanical or electronic mechanisms.
- The right key can open it.
Reveal answer
L
O
C
K
Background information
Locks have been used for thousands of years to secure possessions and spaces. Modern locks range from traditional key-operated mechanisms to electronic and biometric systems.