This document provides an overview of Catholic social teaching (CST). It discusses CST both broadly, as encompassing the Church's teachings on social life throughout its history, and more narrowly, as the modern body of literature from popes and bishops responding to current political, economic, and social issues. It outlines several key principles of CST, including the dignity of the human person, the common good, solidarity, and preferential option for the poor. It emphasizes that CST is rooted in Scripture and aims to guide how Catholics approach issues of justice, peace, and social organization.