Extreme Brevity

Flash literature is a style of fiction literature or fiction of extreme brevity. There is not a clear definition of the length or terms of this category. Some self-described marketers for flash fiction literature impose 300, while others consider stories as long as one thousand words.
Many people use sudden fiction, micro fiction, micro story, short short, postcard fiction, and even prose poetry, as an equivalent to flash fiction literature.

Flash fiction has roots going to Aesop's Fables. Among the practitioners are famous writers such as Anton Chekhov, O. Henry, Franz Kafka, Ernest Hemingway, Ray Bradbury, Kurt Vonnegut.
Digital life aka Internet gave new beginning and new demand to flash fiction literature.
Extreme brevity could be illustrated by a short story about six-word flash written by Ernest Hemingway: "For sale: baby shoes, never worn."