Keyed alike means that all locks within a set can be opened using the same key. In other words, if your front and back door are keyed alike, then you only need one key to open both doors.

Master key suites make a convenient way to access numerous doors without having to carry all the individual differ keys. It can be used to control who can have access to certain areas. it is also possible to have various key levels (sub-masters) within a master key suite.