Orbital dominance is one of the three criteria under which a celestial body is considered a planet in the solar system. These criteria were adopted by the International Astronomical Union (UAI) in 2006 when it was agreed to create an official planet definition.
In the final stages of the formation of a planet, it creates an orbital dominance, meaning that it is the dominant body and that there are no other bodies of comparable size except its natural satellite (s) or other objects under its gravitational influence. A celestial body that meets the other two criteria to be a planet but does not have orbital dominance is classified as a dwarf planet. In this category are Ceres and Pluto, which share their orbit with other objects of the asteroid belt and the Kuiper belt respectively.
The clear distinction between planets, dwarf planets and other minor planets became necessary because the UAI had adopted different rules for the nomenclature of newly discovered "planets" without establishing the bases to differentiate them.
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