Catechism of the Catholic Church §699 — excerpt
The hand. Jesus heals the sick and blesses little children by laying hands on them. In his name the apostles will do the same. Even more pointedly, it is by the Apostles' imposition of hands that the Holy Spirit is given.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.