What is the thing called which used to throw stones with help of a string?

The thing is called a sling. It is a simple weapon that consists of a cord or strap with a pouch in the middle. The stone is placed in the pouch, and the cord is swung in a circular motion. This causes the stone to be propelled forward at a high speed. Slings have been used for hunting and warfare for thousands of years, and they are still occasionally used today.