Pluto, discovered in 1930, was known as a planet for a long time after its discovery. It is situated beyond Neptune and, since it orbits aroun the sun, is a part of our solar system. After the official definition of planet came out (devised by International Astronomical Union or IAU) in 2006, Pluto was excluded from the list of planets. Now, the official designation of Pluto is a dwarf planet.
As per IAU's definition of planets, Pluto meets the two criteria out of three. It is in orbit around the Sun and has sufficient gravity to be rounded on its own. However, it has not cleared its neighborhood and its mass is a small fraction of the mass of objects in its orbit.
Pluto is not the only dwarf planet in our solar system. The other dwarf planets are Ceres, Eris, Haumea and Makemake.
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