Scroll depth is a website engagement metric that shows how far down a page people scroll and whether users are reading the whole page, stopping at a particular point, or just reading the start. Scroll depth can indicate how good a web page is at retaining the attention of visitors and encouraging them to keep scrolling.
It can also be used to shape your content strategy. If you only have valuable information or CTAs at the bottom of the page but your scroll depth is low, you might need to restructure your page to frontload the most important content.
See also: Pages per session, Engagement