Baptism, or water baptism, is a symbolic rite that symbolically ties the believer to Christ in His death, burial, and resurrection. Baptism is a public expression of this symbolic tie. Baptism is typically done with water, though there are some disagreements between whether or not the believer should, or must be, submerged in water. Some denominations believe that baptism is required. Some believe that baptism is effective for applying grace to the believer.
Romans 6:3-4, Galatians 3:27, Colossians 2:12, Luke 3:3, Acts 2:38,