Retention curve

A retention curve is a chart showing what share of viewers were still watching at each moment of a video, plotted across its length. It turns "did people watch" into "where, specifically, did they stop."

A curve with one sharp drop points at a single moment worth re-cutting; a curve that slopes down evenly says the whole video is losing people gradually, which is a pacing problem rather than one bad cut.

It is the most literal answer to "where did people stop watching," and the one piece of evidence a scenario's hook and pacing decisions can both point back to.

Reading several curves from the same account side by side, rather than one in isolation, is usually what turns a chart into a decision: a drop that repeats at the same point across videos is a pattern, not a coincidence.

A common mistake is reading a single retention curve as if it were the whole story — one video's curve can be shaped by a single distracting edit, while the pattern that actually matters only shows up once several curves from similar videos are compared side by side.

A curve is also where a hook and a hold rate stop being two separate numbers and become one picture: the first few seconds of the curve are the hook's result, and everything after is the hold rate's, drawn as a single continuous line instead of two separate figures. A curve is also worth revisiting after an edit changes: comparing the curve of a reshot opening against the original is a more direct test of a hook fix than hook rate alone, since it shows exactly where the extra seconds were won or lost.

Where it comes from

YouTube's own Studio help describes its audience-retention report the same way.

The key moments for audience retention report explains how well different moments of your video held viewers’ attention.

Read the source: YouTube Help — Measure key moments for audience retention.