Ghosting in online poker occurs when an unauthorized person takes control of another player’s account or session, or provides real-time guidance on decisions during play. This practice violates the terms of service of all poker sites and is a serious form of cheating, as it allows a player to benefit from another person’s skills without opponents’ knowledge. Ghosting occurs in online tournaments and live streams where coaches or professionals dictate plays. Sites detect ghosting through behavioral analysis and abrupt changes in playing style.