What are the main differences in beliefs between Wicca, Paganism, and Druidism?

Paganism is actually a term that spans many different belief systems, all of whom practice the worship of multiple deities. Wicca is a form of paganism in which believers worship one goddess and one god. Druidism is a form of paganism that follows the beliefs of the ancient Druids. I am not a Druid, and therefore can't help you much with specific questions about their style of worship, but I hope that I cleared up the differences between the three terms.