Chop saws are “technically” cut-off saws that are designed to cut metal. Though they’re just as commonly referred to as chop saws, so call them want you want. Chop saws typically use an abrasive wheel which is far better for cutting metal, than a miter saw’s blade.
Chop saws usually don’t have many added features, maybe only an adjustable miter gauge that allows you to make angled cuts up to 45 degrees.
Here’s a quick video on chop saws: