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 flickr photo by froshea shared under a Creative Commons (BY-SA) license
"Nuns" flickr photo by froshea https://flickr.com/photos/froshea/8890122937 shared under a Creative Commons (BY-SA) licensee