Vending machines typically feature slots for coins, bills, and cards. They also have a selection of items to choose from, which are usually displayed on the front of the machine. The items are typically stored in compartments or shelves inside the machine. Vending machines also often have buttons or touchscreens that allow customers to select their desired item and make payment. Finally, vending machines may also feature a variety of safety features such as locks, alarms, and cameras.