Why do meat and fish stay fresh in cans?

Meat and fish stay fresh in cans due to the process of canning, which involves sealing the food in an airtight container and heating it to a high temperature to kill bacteria and other microorganisms that cause spoilage. This process creates a sterile environment inside the can, preventing the growth of harmful bacteria and preserving the food for an extended period. Additionally, the canning process removes oxygen from the container, which further inhibits the growth of spoilage organisms that require oxygen to survive.