A Playblast, is a viewport render from the active camera, used commonly for previewing Animation, Staging and placement and the population of elements in a scene.
It is a term common to Maya users.
This is not a final render, and elements like NURB curves are also rendered.
You could say a Playblast is a video capture of the viewport.
Below is an example of a Playblast[Flour Sack Jump Playblast](https://vimeo.com/258455980) from [Darryl Dias](https://vimeo.com/darryldias) on [Vimeo](https://vimeo.com).
To create a Playblast in Blender, you can follow this guide.
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