Catholic Action refers to the involvement of lay Catholics in the Church's mission to promote social justice and moral values in society. It encourages individuals to engage in community service, advocacy, and education, aligning their actions with the teachings of the Catholic Church. This movement gained prominence in the early 20th century, particularly after the encyclical Quadragesimo Anno by Pope Pius XI in 1931. Catholic Action groups often focus on issues like poverty, education, and family life, aiming to integrate faith into everyday activities and foster a sense of responsibility among believers.