A wonderful definition and valid point that all short story writers and aspirers should be aware of from Schaum’s Quick Guide to Writing Short Stories
We will concentrate on the traditional story—the kind that derives its power from characters, actions, and plot; that has a beginning, a middle, and an end. Not all short stories are like this. An advantage of the short story form is that its brevity allows variations and experiments that would be difficult to sustain throughout the much longer course of a novel.
A short story writer can focus on sketching a character, presenting a slice of life, playing with language, or evoking a mood. Many excellent stories written and published today achieve their impact from the way the author assembles a mosaic of images or jagged fragments of experience, instead of telling an old-fashioned tale. But the traditional story provides the best vantage point for examining the craft of short story writing.