In botany, a sport is a part of a plant (normally a woody plant, but sometimes in herbs as well) that shows morphological differences from the rest of the plant. Sports may differ by foliage shape or color, flowers, or branch

Branch

A branch or tree branch is a woody structural member connected to but not part of the central trunk of a tree...

 structure.

Sports with desirable characteristics are often propagated vegetatively to form new cultivars. Such selections are often prone to "reversion", meaning that part or all of the plant reverts to its original form.