I think originally it was tin cans, that leached lead into the foodI don’t know! Bottling is preserving stuff in sealed glass jars like mason jars.
I have no idea what canning is - I just hear the term but have never explored what it was.
Maybe it is the same thing. I thought canning must involve cans!
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But nowadays canning is putting food into mason jars and either water-bath for acid foods or pressure canning for others.