Synopsis
A complete plot summary — ending included — meant for editors and agents: a working document, not a literary text.
The synopsis summarizes a manuscript's entire plot, ending included: that's its cardinal difference from back-cover copy, which teases without revealing. Aimed at editors and agents, it lets them judge in a few pages whether the story holds — structure, protagonist's arc, the logic of the turns.
Usual conventions: present tense, one to three pages unless specified otherwise, focus on the main line (subplots appear only if they bend the ending). The classic error is styling it: a synopsis isn't a literary text but a building plan — clarity, causality, completeness. Many authors also write one for themselves, as a soundness test before or after the first draft.
Example
"Lea, 34, an art restorer, discovers beneath a varnish…" — and three pages later, the ending is told.