See, for example, An Outline of the Faith, beginning on page 843 of the prayer book. The sacraments are outward and visible signs of inward and spiritual grace, given by Christ as sure and certain means by which we receive that grace. Episcopalians believe that there are two sacraments given and directed by Christ, Baptism and the Holy Eucharist. We celebrate and administer other sacraments grounded in the Bible. Baptism and Holy Eucharist are considered necessary for all Christians.
Confirmation is a normal part of church life.
Not everyone participates in the other sacraments. Baptism is the sacrament of membership in the church. The outward sign is the pouring on of water or immersion in the name of the Trinity. The inward grace is new life, death to sin and rising with Christ. Baptism is birth into eternal life.