Extraterrestrial beings, often referred to as aliens, are hypothetical life forms that originate from outside Earth. Scientists and researchers explore the possibility of their existence through various means, including the study of Mars, Europa, and other celestial bodies that may harbor life. The search for extraterrestrial intelligence (SETI) involves monitoring signals from space for signs of advanced civilizations. Many people imagine extraterrestrial beings as humanoid creatures, but they could take on various forms, depending on their environment and evolutionary history. The concept of aliens has been popularized in science fiction literature and films, sparking curiosity and debate about the potential for life beyond our planet.