Any science fiction in which technical accuracy and scientific plausibility are considered to be of secondary importance to Story. Examples include Star Trek, Star Wars, and Back to the Future.
Writers of soft SF often make at least some effort to keep their universes internally consistent, but it is not recommended for one to attempt to enjoy such works without a capacity for doublethink and suspension of disbelief. Be prepared for technobabble.
Contrast: hard science fiction.