Starship is the second (spacecraft) stage of the fully reusable two-stage super heavy-lift launch vehicle currently developed by leading NewSpace company SpaceX. The main purpose of building such a large rocket with more than double the power of Saturn V is to enable the colonization of Mars. But Starship will be capable to do a lot of different tasks – to place satellites or space stations in orbit, ferry passengers to space stations or the Moon and even ferry passengers or cargo between any destinations on Earth within an hour.
Scott Manley's technical analysis of the flight: