Within Wall Yoga one typically carries out Yoga exercises with the support of straps, ropes, or harnesses attached to hooks on a wall.
It’s not the same as just using the wall as a prop (Yoga at the Wall) to enhance your practice, which consists, for instance, of placing your leg against the wall to do a sustained hamstring stretch, or to perform a supported Yoga headstand (Sirsasana).
Although Wall Yoga is also used to deepen stretches and enhance one’s alignment, it specifically allows for doing inversions (flipping your body 90 or 180 degrees), and thus experiencing the use of other muscles and near-weightlessness while doing Yoga poses.
Other benefits of Wall Yoga include being able to hold Yoga poses longer, practice poses which are otherwise difficult to engage in, increase strength in other muscle groups, and increase mobility and flexibility.