In the Roman Catholic tradition, there are many religious institutes of nuns and sisters (the female equivalent of male monks or friars), each with its own charism or special character. Traditionally, nuns are members of enclosed religious orders and take solemn religious vows, while sisters do not live in the papal enclosure and formerly took vows called "simple vows".
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Nuns on a horse flickr photo by stijn.declercq shared under a Creative Commons (BY) license
"Nuns on a horse" flickr photo by stijn.declercq https://flickr.com/photos/stijndc/1616526511 shared under a Creative Commons (BY) license