Why can't you keep food in tin cans?

Why is it that we can't keep food in tin cans indefinitely? Is there a specific reason why the cans themselves or the food inside eventually degrade over time? Is there a scientific explanation for why canned goods have an expiration date, and what factors contribute to this? Could it be related to the type of food, the canning process, or the materials used in the cans themselves? Understanding the reasons behind this limitation could help us better preserve our food and reduce waste.