An alien invasion refers to a scenario where extraterrestrial beings, often called aliens, come to Earth with the intent to conquer or colonize. These beings are usually depicted in movies and books as advanced creatures with technology far beyond our own. The idea sparks curiosity and fear, as people wonder how humanity would respond to such a threat. In popular culture, stories about alien invasions often feature epic battles between humans and aliens, showcasing the resilience of humanity. Famous examples include films like Independence Day and War of the Worlds, where characters must unite to fight against the alien forces and protect their planet.