Serve URL
A Serve URL is a URL under which a Remotion Bundle is hosted.
When rendering your video, Remotion will open a headless browser and visit that URL in order to make screenshots of it.
The most common use case for a Serve URL is when rendering a video on Lambda, you need to deploy your bundle to Amazon S3, which will make it a Serve URL.
If you have a Serve URL, you can also render a video locally by passing a serve URL instead of an entry point.
A serve URL doesn't have to be on S3, it can be on any provider that supports static deployments (e.g. Netlify, Vercel or GitHub pages) or even be a URL that runs on localhost.