Canning is a process of preserving food in special cans, which serves the double purpose of making seasonal crops available year-round and allowing a reserve stock for use in emergencies. Fruits, vegetables, soups, cereals, meats, fish, milk, and many other products can be canned. The food is heated to a high temperature to kill any bacteria or microorganisms, and then sealed in an airtight container. This method of preserving food has revolutionized the food industry and has made a wide variety of foods available to consumers around the world.