The oven door switch is a on an off mechanism that will shut the oven light off when the oven door is closed. When you open your oven door and the light does not come on, it could be the switch or the light bulb and one of them will need to be replaced. The switch is black in color, has two terminals and is a little over 2” in length. This switch is a genuine OEM part. Please remember to disconnect the power to the oven before starting the repair.