Synopsis vs. blurb: the critical difference
Authors frequently confuse the synopsis and the blurb because both summarize the novel. They serve opposite purposes. The blurb is written for readers and withholds the ending. The synopsis is written for agents and publishers and reveals everything. The blurb creates desire through mystery. The synopsis demonstrates craft through clarity. Using a blurb where a synopsis is required is one of the most common mistakes in manuscript submissions. Know which document you are writing and which audience it is for.