GTO represents a Nash Equilibrium applied to poker where each action is taken at frequencies that make opponents indifferent between their options. A pure GTO strategy mixes bets, checks, calls, and folds at solver-derived frequencies to prevent exploitation. In practice, GTO serves as the theoretical baseline from which players make exploitative adjustments against opponents with identifiable tendencies. Mastering GTO requires deep understanding of range construction, bet sizing, and equity distribution.