What's the whip in horse riding called and where does the rider usually strike the horse?

Question

What's the whip in horse riding called and where does the rider usually strike the horse?

Answer 1

A crop. usually in the shoulder or hind quarters.

Answer 2

It's called a "quirt" and you strike the rear behind the saddle.

Answer 3

It is called the crop or a quirt. Rider usually goes for hindquarters on occasion the withers. Used or should be used as encouragement not punishment.

Answer 4

It's called a crop, a good jockey normally uses it on the haunches... and fans(or taps it) it along the withers. It should only be used to keep a horses attention.

There's great debate as to whether or not they should even be used.