Moon is a satellite because it revolves round a planet (Earth).
Moon is called a natural satellite and it is Earth's only satellite. It is the fifth largest natural satellite in the solar system. The moon is classified as a planetary mass object. Moon was formed around 4.51 billion years ago and moon was formed when there was a great impact of a huge size body, it collided with Earth and the impact blasted materials into earth's orbit and then the accreted materials formed the moon.