Mythology can refer to the collected myths of a group of people—their body of stories which they tell to explain nature, history, and customs. It can also refer to the study of such myths.
A myth is a story which is not true. The definition of the word myth is still subject to debate. Myths may be very old, or new (for example: urban myths). There may not be records or other proof that they happened, but at least some parts of myths may be true. We know about them from older people telling them to younger people. Some myths may have started as 'true' stories but as people told and re-told them, they may have changed some parts, so they are less 'true'. They may have changed them by mistake, or to make them more interesting. All cultures have myths. Stories about the Greek and Roman gods and goddesses are myths.
Many people once believed in mythological animals and gods. These animals or gods may have control or has power over a part of human or natural life. For example, the Greek god Zeus had powers over lightning and storms.

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