Flash Fiction is generally defined as fiction restricted to one thousand words or less.  Telling an engaging, stand-alone story with so few words is both challenging and fun, but the biggest reward from my viewpoint is the quick turnaround.  Writing a novel is like running a marathon.  A flash fiction piece is a sprint, and afterwards you can savor the satisfaction of having told a good story.  It’s also a great way to take a creative break in the process of writing a longer piece.