Pluto is a dwarf planet because it has not cleared its orbital neighborhood.
Why Is Pluto Not Considered a Planet: explained
It orbits the Sun and is nearly round, meeting two planet criteria.
It shares its region with many other icy bodies.
Useful reference
Astronomical classifications come from the International Astronomical Union. Planetary moon discoveries can change published counts; for the latest confirmed totals check NASA and the IAU.
When the answer can differ
Its classification changed in 2006 under the IAU definition.
Common questions
What should I remember?
Pluto is a dwarf planet because it has not cleared its orbital neighborhood.
What is an easy mistake to avoid?
Its classification changed in 2006 under the IAU definition.
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