Henderson was an influential nursing theorist who defined nursing as assisting individuals to meet their 14 basic human needs. She believed health involved being able to independently meet needs like breathing, eating, and communicating. Her theory viewed people holistically, with biological, sociological, and spiritual components. Henderson's definition of nursing and identification of basic needs formed the basis for nursing assessment, planning, implementation, and evaluation. Her work helped establish nursing as an academic discipline and supported research to validate and improve practice. While simple, her theory provided a framework for conceptualizing individual needs and the nurse's role in meeting them.