Definition:
With traditional phone systems, you very often miss important calls because you are already on a conversation on the phone. any person calling you while your line is engaged hits against an annoying beep asking them to hang down.
With call waiting, you no longer miss important calls. If you are already on the phone and another person calls you, you hear a special beep notifying you of this, and you can choose between putting that call on hold, taking it immediately and putting the first call on hold, or sending the second call to voicemail.
