Sale of Chametz
There is an important Mitzvah not to own any Chametz during Pesach. Any food that is made out of grain that has been allowed to rise (ferment) is chametz. Common chametz items include bread, cakes, breakfast cereals, pastas, many liquors and more.
A rabbi can sell your Chametz on your behalf for the duration of the holiday so that it can be enjoyed after Pesach.