The term "alien life" refers to any form of life that is not from Earth. It could be extraterrestrial life, which comes from other planets or stars in our universe, or it could be microbial life forms that exist on other celestial bodies such as Mars or the moons of Jupiter and Saturn. The existence of alien life has been a topic of fascination for scientists, researchers, and enthusiasts alike, with many searching for evidence to support its existence through various missions and experiments.