What are the classic movies about the relationship between humans and aliens?

"E.T. the Extra-Terrestrial" (E.T. the Extra-Terrestrial) is a fresh and tender science fiction film. It tells the story of a ten-year-old boy, Elliot, and a lost little alien, E.T., who broke through the barriers of time and space and established an innocent friendship. How can a movie that doesn't excel in technology, entertainment, or ideological aspects attract audiences of all ages? It's just a simple and clean emotional force that touches people's hearts. Childhood innocence, friendship, mysterious phenomena, and superpowers are perfectly organized together, breaking out of the "hard science fiction" siege and touching generations of moviegoers.