Canned food refers to food that has been preserved in a sealed container, usually made of metal or glass. This process involves cooking the food and then sealing it to prevent bacteria and spoilage. Canned foods can include a variety of items, such as vegetables, fruits, meats, and soups, making them a convenient option for meals. The canning process was developed in the early 19th century, with Nicolas Appert credited for its invention. Canned food has a long shelf life, making it a popular choice for emergency supplies and long-term storage. It is also often more affordable than fresh produce.