The Moon is called a satellite because it orbits another celestial body, in this case, the Earth.

Ecco perché:

* Satellite is a general term for any object that orbits a larger object in space.

* Natural satellites are those that occur naturally, like the Moon orbiting Earth.

* Artificial satellites are those built and launched by humans, like the International Space Station.

So, the Moon fits the definition of a satellite because it revolves around the Earth due to gravitational forces.