Florence Nightingale was instrumental in advancing healthcare standards through her pioneering efforts during the **Crimean War**. After observing deplorable conditions in military hospitals, she implemented rigorous **sanitation** measures and improved nursing practices, significantly reducing the death rate. Nightingale also collected **statistical data**, using it to advocate for reforms in the healthcare system. Her commitment to **education** led to the establishment of the **first nursing school**, formalizing nursing as a respected profession. Overall, Nightingale's contributions laid the foundation for modern nursing and health care reforms, emphasizing the importance of **evidence-based practices** and patient care.