Avalanche hazard reduction is not done in the backcountry or anywhere outside resort boundaries. Each ski resort has boundaries, a roped-off perimeter that separates “in-bound” skiing from “out-of-bounds” skiing. Ski resort maps will typically mark areas that are considered “boundary lines.” The moment you head through a backcountry access gate at a resort (or duck a rope), you are instantly entering into a wild snowpack, meaning a snowpack that has absolutely zero mitigation work done to it and, as a result, can be much more volatile.
The snowpack is defined as “a mass of snow on the ground that is compressed and hardened by its own weight.” To skiers and snowboarders, the snowpack is more than just “a mass of snow.” It’s an intricate system comprised of different layers that, because of variabilities like moisture, temperature, slope angle, aspect, and wind (to name a few), can increase or decrease the likelihood of an avalanche at any given time.
In Europe, they use the terms “off-piste” and “on-piste.” On-piste skiing is anything that is groomed. Off-piste, as you probably put together, is any skiing or riding that takes place off a groomed run. And, unlike resorts in America, many European resorts don’t have actual rope lines to mark off the groomers. So, as with skiing in lift-accessed backcountry areas in America, one should treat off-piste skiing and riding the same as they would by skiing in the backcountry.