Question: difference between Master and non-master

[Madaraxa]

The title says it all.
I use the file without Master or prerelease (which is like beta i guess).
But what is 'Master' in difference to the file without Master?

[jeppevinkel]

Master means that it builds directly the master branch of jellyfin-web, which means it will be the most bleeding edge version with the latest changes, but it could also be changes that might break functionality since it can be untested changes.