What's the difference between a slam ball, a wall ball and a medicine ball?

Across specialist communities the consensus is clear: a slam ball is a thick rubber or PVC shell, usually sand-filled, designed for zero bounce so you can throw it at the floor safely. A wall ball is larger and soft so it's comfortable to catch off a target. A traditional medicine ball is more like a heavy basketball with minimal bounce, better for rotational throws and partner tosses. r/crossfit and r/homegym threads repeatedly warn that slam balls don't rebound, so they're poor for rotational work, while basketball-style med balls can crack if you slam them hard.