What it does
There's no official Magic keyword called "Jump." The closest real mechanic is flying, which lets a creature only be blocked by other creatures with flying or reach. If you encountered "Jump" in a card name (like the old enchantment Jump, which simply grants a creature flying until end of turn), that's an effect, not a keyword ability itself.
If you meant "Flying," here's the nuance people get wrong: flyers can still block non-flying creatures just fine—flying only restricts what can block them, not what they can block. Reach creatures can block flyers but don't gain the evasion themselves.
In Commander, evasion like flying matters hugely for connecting with commander damage (21 from one commander) and chipping down multiple opponents. If you can clarify the exact card or term you saw, I can give a precise ruling.
Iconic cards with Jump
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