Significado da expressão "Inside baseball"

Hello there, folks! How're you doing?

Here it is an expression I've never seen before, I saw it on one of Rachel's English videos where she interviews CRAIG MELVIN, a famous broacaster in US.

Inside baseball

It means inside information that is not pertinent to the general public, like some information about your family.

That's it, see you!


Here it is the video link:
https://www.youtube.com/watch?v=xGBrHbbNZkQ