A lariat or “rope” is a length of rope that is designed to be thrown around a target and tighten when pulled. It is useful to have a rope if you have the skill to use it. It is not very useful otherwise and can be dangerous if misused.
A rope can be used as a butt rope or lead rope and can be helpful in a variety of emergencies. There are many grades and types of ropes available for specific purposes.
Only experienced operators should use a rope on a horse. There is opportunity for injury.
Never tie a horse fast with a lariat around the neck.