This is a fundamental part of the architecture SpaceX has designed to fly Starship missions beyond low-Earth orbit.
Depending on who you ask, SpaceX may need to launch a dozen or more refueling tankers to fill up the methane and liquid oxygen tanks on the Starship lunar lander, which will have emptied its tanks just to get into low-Earth orbit following launch on top of a Super Heavy booster.
The Starship upper stage, in the end, will evolve into multiple designs, creating a fleet of landers, space transporters, refueling tankers, and propellant depots. It's a bold bet on the future of space exploration.
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