VPIP stands for "Voluntarily Put money In Pot" and is a statistic used in poker to track the percentage of hands in which a particular player voluntarily puts money into the pot preflop. It is a preflop stat that tells us how often a player is putting in money given the opportunity. VPIP includes limping (merely calling the big blind), calling, and raising. The formula for VPIP is the number of times a player puts money in the pot divided by the number of hands played. The more current formula for VPIP is the number of times a player puts money in the pot divided by the number of hands played minus the number of walks. A walk is when everyone folds to the big blind, and he wins the pot. VPIP is a valuable tool that helps identify player types, develop strategies, make smart decisions at the tables, and potentially win more money.