Commercially canned food is first packed raw in the can (or bottle); whatever additives they will use, like water, are added; then the cans and lids are heated and sealed together in some process.
[Edit: I guess I didn’t make it clear...the sealing of the can MUST be done at a temperature higher, and for a longer time, than any cooking that a person would normally give the food in their kitchen. Yes, it is cooked...it is overcooked, by kitchen standards. That is why you aren’t poisoned from eating it.]
Frozen food likely goes through some form of ’blanching’ (dipping in hot water), ...
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