Claustration

Enclosed religious orders of the Christian churches have solemn vows with a strict separation from the affairs of the external world. The term cloistered is synonymous with enclosed. In the Catholic Church enclosure is regulated by the Code of Canon Law, either the Latin code or the Oriental code, and also by subsidiary legislation. Enforced in the past with a largely uniform severity, at least in the case of women, it is now practised with a wider variety of custom according to the nature and charism of the community in question.

The stated purpose for such enclosure is to prevent distraction from prayer and the religious life. Depending upon the reason and the length of time, the proper authority (usually the superior gets approval from the local bishop and/or the Holy See) can allow enclosed men or women to leave the enclosure "for a grave cause and with the consent of the superior". This matter is regulated, within the framework of Canon Law and of the particular statutes approved by the Holy See.

Enclosed religious orders of men include monks following the Rule of St Benedict, such as the branches of the Order of Saint Benedict itself, the Cistercian Order, and the Trappist Order, but also monks of the Carthusian Order, Hieronymite monks, and some branches of Carmelite friars, along with members of the Monastic Family of Bethlehem, while enclosed religious orders of women include Canonesses Regular, nuns belonging to the Benedictine, Cistercian, Trappist and the Carthusian Orders, along with nuns of the second order of each of the mendicant orders, including: the Poor Clares, the Colettine Poor Clares, the Capuchin Poor Clares, the Dominicans, Carmelites, Servites, Augustinians, Minims, together with the Conceptionist nuns, the Visitandine nuns, Ursulines nuns (as distinct from "federated Ursulines" of the Company of St. Ursula) and women members of the Monastic Family of Bethlehem.

...
Wikipedia