A D20 die is a twenty-sided polyhedral die commonly used in tabletop role-playing games like Dungeons & Dragons. Each face of the die is numbered from 1 to 20, allowing for a wide range of possible outcomes. Players roll the D20 to determine the success or failure of their actions, such as attacking an enemy or attempting a skill check. The D20 is part of a larger set of polyhedral dice, which includes other shapes like the D4, D6, D8, D10, and D12. These dice are often made from plastic or resin and can come in various colors and designs. The D20 is particularly popular due to its central role in many gaming systems.