A Roman coin is a piece of currency used in ancient Rome and its vast empire. These coins were typically made of metals like gold, silver, or bronze and featured images of emperors, gods, or symbols representing the empire. They played a crucial role in trade and commerce, helping to facilitate economic activities across different regions. The most common types of Roman coins include the denarius, which was a silver coin, and the sestertius, a larger bronze coin. Roman coins not only served as money but also as a means of propaganda, spreading the image and achievements of emperors throughout the empire.