Paganism is a term that covers a great number of spiritual and religious beliefs, and someone who follows one of these beliefs is known as a Pagan. Some of those in ancient times, who are called Pagans today, believed there was not just one god but a number of gods and goddesses. The stories from Greek mythology are famous examples from a pagan religion. Pagans usually focus on spirituality and nature, rather than on doctrines and dogma. Not all pagans are polytheists (belief in more than one god). Some of them are monotheists (belief in only one god).
The word pagan (without a capital P) is often used to describe anyone who holds religious beliefs that differ from the main world religions. A similar term is heathen. Today Pagan, with a capital P, often refers to people who follow Neo-Pagan religions that honour the Earth. The best known Neo-Pagan religion is Wicca. Another well-known neo-pagan faith is Druidism, but there are many other Neo-Pagan religions with different beliefs.