"In jelly, the fruit comes in the form of (only) fruit juice.
    In jam, the fruit comes in the form of fruit pulp or crushed fruit (and is less stiff than jelly as a result).
    In preserves, the fruit comes in the form of chunks in a syrup or a jam. "

More or less the same in the UK, though I'd say jelly is runnier than jam, and you wouldn't put a preserve on bread. Possibly a conserve which is usually a posh jam.