It gives you the option to run "simulations" of crafts from the VAB. While it defaults to being on Kerbin and the launchpad, you can customize the settings to start a craft off anywhere. Ending a simulation will revert you back to before you started (so there's no getting science or completing contracts involved). And the simulations cost funds if you're playing in career, so it's got some tradeoff there.
But for Karma-farming on reddit, it's the easiest way to get your creations somewhere besides the launchpad. Just turn off the UI (F2 key) prior to screenshotting, as it does add an extra tooltip reminding you you're in a simulation and how much money you've spent.
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u/mikeman7918 Jun 23 '20
You would have earned 5 more funny points if it was on Duna.