And jelly is jam in your language, right? It sounds pretty horrid to me. But yes, I have heard that Americans eat that.
We have jelly and jam, and they aren't the same thing. Jelly is clear or translucent fruit spread, made with fruit juice, thickened/jelled with pectin. Jam is a fruit preserve that also includes the flesh of the fruit in question, and is usually much more loose and spreadable than jelly.