The yo-yo is a toy consisting of two equally sized but not specifically equally weighted pieces of plastic, wood, or metal, connected with an axle, with a string looped around the axle. To play, you must slip the top loop over the end of your middle finger, and throw it down. Today there are a lot of yoyo contests based in 5 styles and trick ladder of 25 tricks.
The styles played are: 1A - string tricks generally done with a yoyo with a wider gap, 2A - two looping yoyos, 3A - 1A with two yoyos, 4A - tricks made with a yoyo that is not attached to the string, almost like in the diablo and for last 5A - instead of having the yoyo tied to your finger, you play it tied to a small counter-weight (e.g. dice, ball, etc).