If you are participating in some kind of contest, it is not ethical to bribe the judges on the panel with brownies. On the other hand, don’t stick your tongue out at them either, since they’ll be determining the winner.
Panel is derived from Old French and originally meant “a piece of cloth.” It’s still used as a sewing term, but now it has additional meanings. It can mean “jury,” as above, and can also refer to a flat piece of a hard surface, often rectangular, such as the wood panel of a door or wall. Panel is also a verb meaning "to install panels." Finally, a control panel has a lot of switches and is a way to make some machines work.