A YOYO is a popular toy consisting of a spool that is attached to a string. When the spool is thrown down, it spins and then returns to the hand when the string is pulled. This simple mechanism allows for various tricks and techniques, making it a favorite among children and adults alike. YOYOs come in different sizes, materials, and designs, catering to both beginners and advanced users. The history of the YOYO dates back thousands of years, with origins traced to ancient Greece and China. It gained significant popularity in the 20th century, especially after being marketed in the United States. Today, YOYOs are not just toys but also competitive items, with players participating in events and contests worldwide.