Tin cans are containers made from thin sheets of metal, typically steel or aluminum, that are used to store food and beverages. They are sealed to keep contents fresh and prevent spoilage. The process of canning involves heating the contents to kill bacteria, which allows for long shelf life. The invention of tin cans dates back to the early 19th century, with Nicolas Appert credited for developing the canning process. Today, tin cans are widely used in the food industry, providing a convenient and durable packaging option for products like soup, vegetables, and soft drinks.