New Advent is a Catholic media and reference website that provides religious scholarship, news, commentary, and resources for readers interested in the Catholic faith. Describing itself as the largest Catholic website in the world, it brings together a broad range of material for study, prayer, and engagement with Church life. Its reference library includes an encyclopedia, the Summa Theologica, writings of the Church Fathers, the Bible, and other books, supported by a searchable archive and an alphabetical index.

New Advent also publishes current articles and reports on the Vatican, the pope, bishops, Catholic communities, and issues affecting the Church. Its commentary explores theology, Scripture, prayer, saints, Catholic social teaching, education, and the practical challenges of Christian life. Contributions come from a range of writers, clergy, scholars, and commentators.

The site serves both as an online Catholic library and as a publication for ongoing discussion, offering readers historical texts alongside contemporary analysis and news