Canned tomatoes are tomatoes that have been processed and sealed in a can to preserve their freshness and flavor. They are available in various forms, including whole, diced, crushed, and pureed. Canned tomatoes are a convenient ingredient for many recipes, providing a rich base for sauces, soups, and stews. The canning process involves cooking the tomatoes briefly and then sealing them in airtight containers. This method helps retain the tomatoes' nutrients and taste, making them a popular choice for home cooks and professional chefs alike. Canned tomatoes are often used in dishes like spaghetti sauce and chili.