The only difference between an inswing door and an outswing door is in the hardware, unless it has a glass in it, then you wouldn't want the screws to mount the glass outside. When spec'ing a door, the use and primary traffic flow determines the swing, left or right, or left reverse or right reverse. Here the hardware will differ with NRPs (non removable pins) and of course which way the lock is installed. Closures come with parts to install either way, most locks do too. But for the most part, an exterior door is most always an inswing door.