Baptism in Christianity is a significant sacrament symbolizing spiritual rebirth and initiation into the Christian faith. It serves as a public declaration of one's commitment to follow Jesus Christ, representing the cleansing of sins and the start of a new life in Christ. Immersion in water or the application of water signifies purification, renewal, and the Holy Spirit's transformative presence. Baptism is practiced in various Christian denominations, but its core essence remains a central rite of passage, marking the beginning of a lifelong journey of faith.