A satellite is any body in orbit around a larger body. Specifically, this can mean either of the following:

• A natural satellite, any natural body in orbit around another. This term is usually applied to the various moons that orbit the planets of our solar system, but since the planets themselves orbit the sun, they too could be called "satellites" from a certain perspective.

• An artificial satellite, which is a man-made object orbiting a planet. Examples include the Hubble Space Telescope, the Mars Express orbiter, and the various GPS satellites currently orbiting the Earth.