According to SpaceX‘s press release:
SpaceX’s Starship and Super Heavy Rocket represent a fully-reusable transportation system designed to service all Earth orbit needs as well as the Moon and Mars. This two-stage vehicle, composed of the Super Heavy rocket (booster) and the Starship (ship), will eventually replace Falcon 9, Falcon Heavy and Dragon. By creating a single system that can service a variety of markets, SpaceX can redirect resources from Falcon 9, Falcon Heavy and Dragon to Starship, which is fundamental in making the system affordable.
Watch SpaceX’s Starship and Super Heavy Rocket in this concept video below: