What is an "Access Control System"?

Simply defined,  the term "access control" describes any technique used to control passage into or out of any area. The standard lock that uses a brass key may be thought of as a simple form of an "access control system".

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Over the years, access control systems have become more and more sophisticated. Today, the term "access control system" most often refers to a computer-based, electronic card access system. The electronic card 

access system uses a special "access card", rather than a brass key, to permit access into a secured area.

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