Why is Pluto no longer considered a planet in the solar system what kind of object is it considered to be now?

Pluto is no longer considered a planet because, in 2006, the International Astronomical Union (IAU) redefined the criteria for planet classification, which Pluto does not meet. Specifically, it does not clear its orbital neighborhood of other debris. Instead, Pluto is classified as a "dwarf planet," a category that includes other small celestial bodies that share similar characteristics.