Do I have to pay to return an item?

I'm curious about the return policy for a recent purchase I made. Could you clarify whether or not I'm required to pay any fees or charges in order to return an item? I understand that there may be certain conditions or exceptions, but I'm specifically interested in the general rule regarding payment for returns. Is there a standard policy in place that outlines whether or not I'll be expected to cover any costs associated with the return process?