Why is my oven making noise even when it is turned off?

There could be a few reasons why your oven is making noise even when it is turned off. One common reason is that the cooling fan or the convection fan may still be running to cool down the oven after use. Another possibility is that there may be a problem with the oven's heating element or other internal components causing the noise. It is recommended to have a professional technician inspect and repair the oven to determine the exact cause of the noise.