The alb, a sacred object used in Catholic worship, is a long, white linen garment. It's simple, usually reaching the ankles, with long sleeves and a wide neck. Primarily used in liturgy, the alb is worn by priests, deacons, and other ministers during Mass and other liturgical services. Its symbolic meaning represents purity and innocence, visually signifying the priest's dedication and the cleansing nature of the sacraments. It's an essential part of the vestments used in Catholic worship.