A crater is a bowl-shaped depression on the surface of a planet, moon, or other celestial body. It is typically formed by the impact of a meteorite or asteroid, which creates a hollow space as it collides with the surface. Craters can vary in size, from small pits to large basins, and they often have raised rims. In addition to impact craters, there are also volcanic craters, which form when a volcano erupts and the top collapses inward. These craters can be found on Earth, as well as on other bodies like the Moon and Mars. Craters provide valuable information about the geological history of these celestial bodies.