Canning is a method of food preservation that involves processing and sealing food items within airtight containers. This technique is designed to extend the shelf life of various products by preventing spoilage.
The typical shelf life for canned goods ranges from one to five years, though it can be significantly longer under specific conditions. For example, a freeze-dried canned product, such as canned dried lentils, may remain in an edible state for as long as 30 years.