Frozen foods are foods raw or cooked that have been frozen so that it is preserved to the time it is prepared or to the time it is eaten. Frozen foods have a slow decomposition rate because the residual moisture is turned into ice which slows down the growth of most bacterial species. Foods at home can be frozen using household freezers. Frozen food also comes in packaging. Many frozen foods are cooked in a microwave oven. Frozen foods are convenient, though they lack the freshness in taste found in raw materials.