What is an asterriod?

Answer 1

An asteroid's definition is a object that orbits around the sun at a certain velocity, asteroids are most commonly found between the orbit of Mars and Jupiter
and there is also another asteroid belt located behind the orbit of Neptune

Answer 2

An asteroid is a small rocky body that orbits the Sun. They are remnants left over from the early formation of the solar system and can vary in size from a few meters to hundreds of kilometers across. Many asteroids are located in the asteroid belt between Mars and Jupiter, but they can also be found throughout the solar system.