534. What is prayer?Prayer is the raising of one's mind and heart to God, or the petition of good things from him in accord with his will. It is always the gift of God who comes to encounter man. Christian prayer is the personal and living relationship of the children of God with their Father who is infinitely good, with his Son Jesus Christ, and with the Holy Spirit who dwells in their hearts.
Further reading: CCC 2558-2565, 2590535. Why is there a universal call to prayer?
Because through creation God first calls every being from nothingness. Even after the Fall man continues to be capable of recognizing his Creator and retains a desire for the One who has called him into existence. All religions, and the whole history of salvation in particular, bear witness to this human desire for God. It is God first of all, however, who ceaselessly draws every person to the mysterious encounter known as prayer.
Further reading: CCC 2566-2567