Key
From Wikipedia, the free encyclopedia
- For the keys used in cryptography, see key (cryptography)
A key is an object used to open and close things, for example, doors. Keys are also used to turn on cars, machines and other things.
A key is used by placing the key into the slot of the thing you want to unlock.
[change] History
The key was likely invented by Theodore of Samos in 6th Century BC.
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