A yo-yo is a popular toy consisting of two discs connected by an axle, with a string attached to the axle. When the yo-yo is thrown down, it spins and can return to the hand when pulled back. This simple mechanism allows for various tricks and styles of play, making it enjoyable for people of all ages. Yo-yos come in different materials, such as plastic and wood, and can vary in size and weight. They are often used in competitions, where players showcase their skills and creativity. The history of the yo-yo dates back thousands of years, with origins in ancient Greece and China.