Difference between default and source repositories in Discover

I’ve recently gone through settings in Discover, and noticed default and “source” repos. I can understand the difference between testing/debug and main, but I don’t quite understand what exactly “Source” means in this context. Attached below is an example, default is enabled and source is… well it’s there I guess.

Would anyone please explain the difference to me because when looking it up in a browser I find completely irrelevant results.

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Source contains the source code for a package, if you want to compile the contents of that package entirely yourself.

If you never compile your own code, you don’t need it.

Thank you, that answers it