"Comet Sample Return" refers to missions designed to collect and bring back material from comets to Earth for analysis. Comets are icy bodies that can provide valuable information about the early solar system and the origins of water and organic molecules on Earth. These missions involve spacecraft that travel to a comet, gather samples of its surface or coma, and then return to Earth. Notable missions include NASA's Stardust, which returned samples from Comet Wild 2 in 2006, and JAXA's Hayabusa2, which aims to return samples from Ryugu, although it focuses on an asteroid rather than a comet.