The most used door is the rebated door. In it, the rebate is a small step at the edge of the door leaf. As a result, the door leaf rests on the frame.
A seal on the frame (door frame) provides the necessary sealing and soundproofing.

The advantage of rebated doors is that they cover the gap between the door frame and the door leaf and thus hardly let any light through when the door is closed.

Doors for very high sound insulation requirements have door leaves with double or even triple rebate.

Non-rebated door

Doors without a rebate are called non-rebated doors.
Architects often require a harmonious and flush finish between the door leaf and frame. This is achieved by non-rebated door leaves. In practice, however, light gaps often occur in the closed state due to installation tolerances. Likewise, the sound insulation is somewhat lower compared to rebated doors.
Advantages are the modern elegance and aesthetic appearance. Due to the flushness of the frame and door leaf, it is an absolute eye-catcher in the room.

Rebated door / Non-rebated door