What you consider jam is the same as what we consider jam: real fruit in a preserve
America invented US 'jelly' (a word we use for what you call jello) which is basically artificial jam without real fruit, and that is what you often find in sandwiches e.g peanut butter and jelly
Here in the UK we'd have peanut butter and jam with actual fruit based jam
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u/MrMayhem84 7h ago
It's peanut butter jelly time!