Hmm... do you mean the difference between jam and jelly?
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Peanut butter is a food paste made from ground roasted peanuts. It is popular throughout the world and used mainly as a sandwich spread.

Fruit preserves or Jam refers to fruits or vegetables that have been prepared and canned for long term storage. The preparation of fruit preserves traditionally involves the use of pectin as a gelling agent, although sugar or honey may be used as well. There are various types of fruit preserves made globally, and they can be made from sweet or savory ingredients.
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They're so different that I believe you must have meant to ask something else.

Peanut butter: A spread made by grinding-to-a-paste roasted peanuts, which are the tubors of a popular legume grown all over the old south of the USA because it's a good crop to follow cotton with. Cotton takes a lot out of the soil, and peanuts are good for puting fixed nitrogen back in.

Peanut butter has a savory flavour, with lots of protien and hydrocarbons.

Jam: A spread made by boiling down sweet fruits and mixing the mash with lots of sugar and pectin.

Jams are sweet, with lots of carbohydrates and fibre, but not so much protien or hydrocarbon.

Other than the fact that they're both rendered as spreads, they're about as different as two plant-based foods can be, which is why I wonder if you were asking the right question, but in any case, they taste *great* together, and because they are so different, when combined they darn near form a total food.

It's famous for being an easy kid's food, and I'm with that. It's a timeless classic favorite of sweet-toothed children everywhere.

If there are kids running around whining for food, I put out bread and peanut-butter and jam and tell them to not make a mess (as if that'd work, but it says I'm not going to prepare it) and then I let them much away, as much as they want if they're being active, because, curiously, it never seems to ruin dinnertime appetite (although probably *nothing* would ruin dinnertime appetite if they've been playing hard).

The popular coloquialism for peanut butter and jam sandwitches is P.B.&J., and I think of it as the lazy-man's baclava, where instead of honey you're using jam, instead of ground caches and pistachios you're using peanut butter, and instead of pastry you're using bread.
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Peanut Butter is made from peanuts.
Jam is made from fruit.
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When Kobe Bryant drives the lane its peanut butter.

When Lebron James dunks from the foul line, that's jam.
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