Meaning of the word "speculative fiction" in English

What does "speculative fiction" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

speculative fiction

US /ˈspɛkjəˌleɪtɪv ˈfɪkʃən/
UK /ˈspɛkjʊlətɪv ˈfɪkʃən/

Noun

a broad genre of fiction that encompasses works with elements that do not exist in the real world, often including science fiction, fantasy, and horror

Example:
Many classic novels fall under the umbrella of speculative fiction.
She enjoys reading all kinds of speculative fiction, from dystopian futures to magical realms.