Difference between synopsis and executive summary is that: a synopsis is a brief summary of the major points of a subject or written work or story, either as prose or as a table; an abridgment or condensation of a work, while executive summary is a short document or section of a document, produced for business purposes, that summarizes a longer report or proposal or a group of related reports in such a way that readers can rapidly become acquainted with a large body of material without having to read it all.