Why does Pluto no longer considered a planet?

Native speaker’s answer
Rebecca
Pluto is no longer considered a planet because it doesn't meet the criteria the IAU (International Astronomical Union) used to define a full-size planet. Although it is considered a "dwarf planet." Some of the reasons for it not being considered a full-size planet includes its size, it's not bigger than earth's moon, Pluto also orbits differently from the other planets, and it's dense and rocky.