Flash fiction is a type of short story that typically ranges from 100 to 1,000 words in length. It's called flash fiction because it delivers an impactful and complete narrative within a very brief period of time - much like a flash of lightning. The stories are often characterized by their economy of language, with writers using precise and evocative descriptions to convey emotions, characters or events in just a few words. Flash fiction can be used to explore a wide range of themes and ideas, from humor to tragedy, and is an excellent form for experimenting with different writing styles and techniques.