A gumball machine is a vending device that dispenses gumballs, which are small, round pieces of chewing gum. Typically made of glass and metal, these machines allow users to insert coins and turn a knob to receive a gumball. They are often found in places like arcades, restaurants, and candy stores. Gumball machines come in various sizes and designs, appealing to both children and adults. Some machines offer different types of candy or toys instead of gumballs. The colorful display of gumballs inside the machine attracts customers, making it a popular choice for a sweet treat.