Madeleine Leininger developed the theory of Transcultural Nursing to discover and explain culturally based factors that influence health and provide culturally congruent care. The theory aims to tailor nursing care to patients' cultural backgrounds through understanding their values, preferences, and environments. By conducting cultural assessments and considering concepts of person, health, environment, and nursing, nurses can plan culturally appropriate interventions to improve health outcomes for diverse populations on local, regional, and global levels.