What Is Ski Mountaineering? A Beginner's Guide

Skiing in the backcountry can look a number of different ways. Anything from skiing out a gate at a resort for a quick backcountry lap to a short ski tour for some low-angle pow turns an all-day mission for a specific line can constitute backcountry skiing.
But at what point does backcountry skiing turn into mountaineering? Or maybe the question is when should mountaineering start involving skiing? Here's a breakdown of what exactly constitutes ski mountaineering, what you need for it, and a few