Wall Jumpings is a glitch found in World of Warcraft that allows players to reach sealed off areas. It forms the backbone of most World of Warcraft glitches.
Wall jumping is performed by walking up to a wall or other barrier and pressing jump and forward at roughly the same time, though jump must always be first. Usually, depending on your skill and the particular wall you chose, you will just fall back to the ground, but if performed correctly, you will land and float in midair, where you can continue to wall jump. By repeating this process successfully (one mistake will make you fall back to the nearest surface) you can reach the top of the barrier and walk around. A famous example of a whole new area that can only be accessed through wall jumping is the area below Stormwind City