From the Catechism of the Catholic Church glossary
VENERATION (OF SAINTS): Showing devotion and respect to Mary, the Apostles, and the martyrs, who were viewed as faithful witnesses to faith in Jesus Christ. Later, veneration was given to those who led a life of prayer and self-denial in giving witness to Christ, whose virtues were recognized and publicly proclaimed in their canonization as saints (828). Such veneration is often extended to the relics or remains of those recognized as saints; indeed, to many sacred objects and images. Veneration must be clearly distinguished from adoration and worship, which are due to God alone (1154, 1674, 2132).
Summary of the Catechism section on prayer
2680
Prayer is primarily addressed to the Father; it can also be directed toward Jesus, particularly by the invocation of his holy name: "Lord Jesus Christ, Son of God, have mercy on us sinners."
2681
"No one can say ‘Jesus is Lord', except by the Holy Spirit" (1 Cor 12:3). The Church invites us to invoke the Holy Spirit as the interior Teacher of Christian prayer.
2682
Because of Mary's singular cooperation with the action of the Holy Spirit, the Church loves to pray in communion with the Virgin Mary, to magnify with her the great things the Lord has done for her, and to entrust supplications and praises to her.
The catechism is available to read at USCCB.org