Key Tag
An access control identification device assigned to an individual to give that individual access rights to an access control system. Typically, the tag is attached to a key ring or similar device to provide quick, convenient access to the tag. Each tag has a unique identification code. That identification code is used by a controller to determine through which doors and at what times of day cardholders are granted access to a secure area.

Keyless Access Control
An access control system that controls access using something other than a key and a lock; typically some kind of reader and an electric door lock.

Keypad
An alphanumeric grid which allows a user to enter an identification code.

Keyswitch
A lockable switch operated by a key.