Definition & Meaning of "alien invasion"

What is "alien invasion"?

Alien invasion is a common theme in science fiction where extraterrestrial beings come to Earth with hostile intentions. These stories typically depict the arrival of alien forces that threaten humanity, leading to conflicts and battles between humans and the invaders. The narrative often explores the impact of the invasion on society, technology, and the environment, as well as themes of survival and resistance. Alien invasion stories aim to create excitement and suspense by imagining how humanity might respond to an external and extraordinary threat.