The asteroid belt is a torus-shaped region in the Solar System which is located between the orbits of the planets Jupiter and Mars,the astroeid belt has many irregular shaped bodeis which are of course even smaller than the planets.
When Jupiter formed just beyond the snow line, its powerful gravity prevented nearby material inside its orbit from coalescing and building planets.Instead,Jupiter's influence caused the material to collide and break apart. These fragmented rocks settled into an asteroid belt around the sun.seperating the rocky planets from the gaseous planet.
Astronomers think that if it were not for the giant planet Jupiter exerting its gravitational force on the asteroids in the belt, the inner planets would be constantly bombarded by large asteroids. The presence of Jupiter actually protects Mercury, Venus, Earth, and Mars from repeated asteroid collisions!That makes jupiter a really important planet of our solar system.