This report examines the nursing theory of Florence Nightingale, focusing on her environmental theory. The paper begins with a biographical overview of Nightingale, detailing her background and the context in which her theory emerged, including her experiences during the Crimean War and her commitment to improving patient care. It then outlines the major precepts and components of her theory, such as the importance of a clean and supportive environment, including ventilation, lighting, and hygiene. The report further discusses the practical applications of Nightingale's theory in contemporary nursing practice, highlighting its relevance to holistic patient care and disease prevention. The summary emphasizes the enduring influence of Nightingale's work on nursing, despite some limitations when compared to modern theories, and concludes by referencing the impact of her personality, education, and spiritual experiences on the development of her ideas.