I read Do Androids dream of electric sheep? by Philip K. Dick.
This is the book that got turned into the Blade Runner film. The differences surprised me. The film is not much like the book at all.
The phrase "Blade Runner" is not used in the book at all. Deckard is called a "Bounty Hunter". And the replicants are called androids or "Andys" for short.
The film was better than the book. The changes helped it.