Yo-yo is a small toy that has become popular throughout the world. The yo-yo consists of two round, flat pieces of wood or plastic joined at the center by a small peg. A string is attached to the peg and winds around it. The player ties the free end of the string to one finger. The yo-yo spins in and out of the hand as the string winds and unwinds. Players can perform many tricks with the yo-yo, and international competitions and festivals have been held.