u/Ender4rmyXD

I am in need of some help to anyone who knows their stuff with Unity. I am helping someone out as a playtester for their game which, of course, they built as a windows executable. That isnt that much of a problem but we thought to atleast try out to make it for linux. I know there is a selection. Where under "Windows | Mac | Linux" you can choose Linux as a Target Platform. I was curious in what format is Unity exporting that, and , what format is recommended to put on steam for a linux native build?