A visitor who watches is a visitor who stays.
Search engines can see that.
Most people do not read. Your customers skim a page, decide in a moment whether it is worth
the time, and go back to the results. Put a video on that same page and your customers stop
and watch it through instead.
That difference has a name. Dwell time is how long somebody stays before returning to search,
and it is one of the ways Google works out whether a page actually answered the question it
ranked for. A video is the most reliable way to move it, because watching is the one thing your
customers will do without being asked twice.
The video earns the page its position a second way as well. A transcript, captions and proper
markup mean every word spoken in it is indexed like the rest of your content — so one
production both holds your customers and gives search something more to read.