Transcultural Nursing is a nursing specialty focused on understanding and providing culturally congruent care to diverse populations. It involves comparing cultures to understand universal similarities as well as culture-specific differences in areas like health beliefs, caring practices, and responses to illness. A key founder, Madeleine Leininger, developed theories recognizing how culture influences health and developed models for providing culturally appropriate care. This includes assessing six cultural dimensions - communication, space, social organization, time, environmental control, and biological variations - that affect healthcare interactions across groups.