Canned goods are food items that have been preserved in metal containers, typically made of steel or aluminum. This method of preservation helps to extend the shelf life of the food, making it safe to eat for months or even years. Common examples of canned goods include vegetables, fruits, soups, and meats. The canning process involves sealing the food in a container and heating it to kill bacteria and enzymes that can cause spoilage. This technique was developed in the early 19th century and has since become a popular way to store food, providing convenience and reducing waste.