Electronic or keyless access control systems offer a flexible, cost effective alternative to the traditional lock and master key system.
Or they allow you to specify time schedules depending on who needs to access your building or facility (eg cleaning crews or maintenance personnel) And because they are able to create audit trails, it is possible to trace movement of people within the premises.
This is unnecessary when using an electronic access system. It is easy to invalidate a certain access credential without affecting other users.