This is a craft file of a rocket that will put itself into a stable orbit without any need of adjustments or button presses. I doesn't make use of any mods and only uses the original KSP parts. Very usefull for those having a hard time getting into space and want to have a quick way to get there without the need of installing mods.
All you need to do is put this in the /ships/vab folder of your save file. No backups needed.
The default location of your saves is: "C:\Program Files\Steam\SteamApps\common\Kerbal Space Program\saves"
Here's a video to show you what this is