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A Dwarf Planet is a  celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.

The three criteria of the IAU for a full-sized planet are:It is in orbit around the Sun.It has sufficient mass to assume hydrostatic equilibrium (a nearly round shape).It has "cleared the neighborhood" around its orbit.Pluto meets only two of these criteria, losing out on the third. Thus, Pluto is considered a dwarf planet.