What are these?

So i had a tool called ‘fist’ and a tool called ‘seawater’, but when i typed the names and scrolled through the suggestions i saw these:

File
Secret

these classes did not have any descriptions, and like the plugin class, no suggestions are given when you use them. i don’t know if they have a constructor.
but why do they exist? why are they here? what do they do?
I mean for files, we already have DataStoreService right? and i don’t even know what Secret is supposed to do.
the reason i know these are part of the language is because, like datatypes, they glow red when you type them:
Secrets
so what do you use them for?

Thanks in advance!

This data is used for plugins.

I can’t say anything about secret, but as far as I know, this function is in testing.