God calls. We respond. A vocation is a response to a specific call that Jesus Christ places on our hearts. It is our individual way of living discipleship in the Church.
Our primary call, through the Sacrament of Baptism, is to be a follower (disciple) of Jesus Christ.
It is to be a holy person. Within that first call to follow Christ, God calls us in specific ways to live a vocation to the married life, the single life, the consecrated religious life or the ordained life.