What is it called when a planet or moon orbits around another object?

You answered your own question! When a planet or moon revolves around another object it is said to be in orbit.

It is called orbiting!! ; )

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.