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Phantom or Normal
Visually move around while your character stays in one place
Fly through walls/scenery while your body stays in one place
Walk around normally but your character stays in one place
Ghosting is considered to be the "predecessor" to OPK hacks, since Tapping is not actually a hack. Also note that Ghosting can be evaded, if a player runs around constantly to avoid damage. Furthermore, it should be noted that the damage direction indicator (a red quarter-circle with an outward facing point in the middle) will point in the direction of the second type of "Ghost's" actual body when you are hit. If the player quickly runs in the direction indicated (up for forward, down for behind, left for left, right for right, etc.) the hacker can be found and killed, if shot quickly enough.