Spanish wine law follows the European DOP/IGP system: Vino de la Tierra corresponds to IGP, while protected-origin categories include Vino de Calidad, Denominación de Origen (DO), Denominación de Origen Calificada (DOCa), and Vino de Pago.
Each appellation defines its geographic boundaries, permitted grapes, yields, production methods, aging requirements, and labeling rules, while terms such as Crianza, Reserva, and Gran Reserva indicate legally regulated periods of maturation.