Madeleine Leininger developed the theory of Transcultural Nursing in the 1950s after noticing differences in child behaviors had a cultural basis. Her theory focuses on providing culturally congruent nursing care through understanding a patient's beliefs, values, and practices. She developed the Sunrise Model to illustrate the dynamic relationship between culture and care. The goal of transcultural nursing is to deliver therapeutic and meaningful care by incorporating cultural knowledge into nursing practice. Leininger's theory emphasizes caring as the central concept of nursing and highlights the importance of considering environmental and cultural factors to achieve optimal health outcomes.