What is the term for the region of our solar system that is populated by a large number of asteroids?

The term for the region of our solar system that is populated by a large number of asteroids is the Asteroid Belt. This area lies between the orbits of Mars and Jupiter and contains millions of asteroids, ranging in size from small rocks to dwarf planets like Ceres. The Asteroid Belt is significant because it represents a remnant of the early solar system, where debris from the formation of the planets did not coalesce into a full planet, primarily due to the gravitational influence of Jupiter.

In contrast, the Kuiper Belt is a region beyond Neptune that contains many small icy bodies and is known for its relation to objects like Pluto. The Oort Cloud is a theoretical cloud of icy objects believed to surround the solar system at a great distance and is thought to be the source of long-period comets. Exoplanet Rings refer to rings around planets outside our solar system and are not relevant to the context of asteroids within our solar system. Thus, the Asteroid Belt is the correct answer as it accurately describes the concentration of asteroids located between Mars and Jupiter.