1984 by George Orwell
Brave New World by Aldous Huxley
Dune by Frank Herbert
Fahrenheit 451 by Ray Bradbury
Enders Game by Orson Scott Card
Frankenstein by Mary Shelley
Foundation by Isaac Asimov
Slaughterhouse Five by Kurt Vonnegut
Stranger in a Strange Land by Robert A. Heinlein
Hitchhikers Guide to the Galaxy by Douglas Adams
The Hunger Games by Suzanne Collins
The Time Machine by H.G. Wells
Science Fiction stories all involve strong elements of technology such as computers and machines. They can also involve travelling through space, time, or alternate universes that may be populated by alien life-forms.
SOURCE: Malatesta, Mark (1019), The Book Genre Dictionary, https://book-genres.com/science-fiction-definition/