A Papal Encyclical is a formal letter issued by the Pope, typically addressed to bishops and the faithful. These documents communicate important teachings, guidance, or positions on various issues, including faith, morality, and social justice. Encyclicals are considered significant in the Catholic Church and often reflect the Pope's views on contemporary challenges. The term "encyclical" comes from the Greek word meaning "circular letter." They are part of the Church's magisterium, which is the teaching authority of the Catholic Church. Notable examples include Pope Leo XIII's "Rerum Novarum," which addressed social issues, and Pope Francis's "Laudato Si'," focusing on environmental concerns.