A lander is a space vehicle designed to soft-land on a celestial body.
A lander can be manned or unmanned, designed to return or not. If the lander is designed to return, it must carry enough fuel both for landing and launch. In this case, like the Apollo missions, a part of the landing module, a part of the landing module might remain on the surface.
Sometimes, a lander might carry Rovers as their payload.
Ships that return to Earth can be considered landers, but, technically, they are listed as return vehicles.
Throughout the space history, there have been many landers. May we remember the famous manned Apollo landers on the Moon, the Soviet Venera landers on Venus, the Huygens lander on Titan and the so many probes that landed on Mars.