Preserves, perhaps, can refer to a variety of methods used to preserve food. JAM is a type of preserve made by boiling fruit and sugar together until thickened. CANS are a common way to store food for long periods of time, as the airtight seal prevents spoilage. Encasing food in wax or paraffin is another method of preserving food, as it creates an airtight seal that keeps out moisture and oxygen. Salting is a traditional method of preserving food, as the salt draws out moisture and prevents bacteria from growing.