Having the initiative means you are driving the action while your opponent scrambles to respond. This is distinct from a material or positional advantage — a player can have the initiative even when down material, using active piece play and threats to keep the opponent off balance.
The initiative is most commonly gained through superior development, active piece placement, and forcing moves. Gambits in the opening sacrifice material specifically to gain the initiative, relying on rapid development and immediate threats to compensate for the material deficit.
Maintaining the initiative requires constant pressure. If the player with the initiative makes a passive move or fails to create new threats, the opponent can consolidate and seize the initiative themselves. Converting the initiative into a tangible advantage (material gain, winning attack, or favorable endgame) is a crucial skill that separates good players from great ones.