A vocation is a call from God to do something specifically for God and for His Kingdom.  The primary vocation of every person is to be holy.  It is the divine calling to love and serve God, to obey his commandments, and to cooperate with Christ in the work of redemption by loving and serving others.  Everyone is called to live the vocation of holiness, but everyone lives it in a special and unique way according to the plan of God.