Why do some recipes include "kosher" salt as opposed to regular salt?

Full transparency: I am german and if this is connected to Jewisch people somehow... Well I wouldn't know because I have never met one in real life. My knowledge about their culture is embarrassingly small because what we're taught in school is pretty much only what's related to my country's history.

So my question is: Why do some food recipes specificy that the salt needs to be kosher? Is there a difference between kosher and non-kosher salt? My knowledge about kosher is only "Don't eat meat and dairy at the same time".

They did not teach us a lot about that in school. And I don't want to be ignorant and uninformed.

Sorry if this question is stupid.