Which is more polite: Knocking on the door or ringing the door bell?

When you knock on the door, it's more of an impatient sound when heard from the other side of the door. When you ring the door bell, it's more annoying because it sounds as if the person just wants people to know he/she is there.
 
because it sounds as if the person just wants people to know he/she is there.

Yes, that is its reason for existence.
 
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