A yo yo is a toy which in its simplest form is an object consisting of an axle connected to two disks, and a length of string looped around the axle, similar to a slender spool.
It is played by holding the free end of the string known as the handle allowing gravity or the force of a throw to spin the yo yo and unwind the string , then allowing the yo-yo to wind itself back to one's hand, exploiting its spin .
This is often called "yo-yoing". First made popular in the 1920s, yo yoing remains a popular pastime of many generations and cultures.
It was first invented in ancient Greece.
