Benedictines: The Benedictines are the oldest religious order established by St. Benedict of Nursia. Benedictine monks and nuns take vows of obedience, stability, and conversatio. This means that the Benedictines are obedient to the abbot, stay in the same place for the rest of their life, and are converted to a specific way of living. Most monks work in fields relating to education or agriculture.
Franciscans: The Franciscans are a religious order started by St. Francis of Assisi. The Franciscan brothers and sisters take vows of poverty, chastity, and obedience. They usually serve in poor communities throughout the world, from New York to Africa to the Middle East to the Philippines.
Jesuits: The Jesuits, or the society of Jesus, was started by St. Ignatius of Loyola. Jesuits, like Franciscans, serve throughout the entire world, but even more so in educational environments like Boston College. The Jesuits take vows, like the Franciscans, of poverty, chastity, and obedience.
Pictured to the right: St. Anselm Abbey in Manchester, NH, a Benedictine monastery.