Mythology is a collection of myths that are part of every culture and serve as the underlying form of every civilization
Myths are sacred tales that explain the world and human experience. They are often used to teach people about events that they could not always understand, such as illness and death, or earthquakes and floods.
Civilisation on the other hand refers to complex way of life that came about as people began to develop networks of urban settlements.
While civilisation is a real entity, mythology is not.