Casually speaking, it's a planet - a big roundish thing orbiting the Sun. But when talking about the solar system it can be useful to distinguish between planet

Casually speaking, it's a planet - a big roundish thing orbiting the Sun. But when talking about the solar system it can be useful to distinguish between planets and dwarfs in some contexts. The 8 planets grew massive enough to 'boss' their orbits whereas the dwarf planets did not. There may be hundreds of dwarf planets hiding in the outer reaches of the solar system.