A Papal Encyclical is a circular letter which is written by a Pope to an audience of bishops and is intended to guide them in their ministry.
Laudato si' is the Pope's Encyclical Letter on the environment
The Holy Father Pope Francis’ first encyclical letter has been released called Lumen Fidei, or 'Light of Faith.
Pope Francis's Encyclical Letter on the Environment and Human Ecology.
Here you will find Papal Encyclicals with a focus on Social Teaching.