Sanitation and public health refer to the measures and systems designed to promote health and prevent disease through the management of waste, clean water supply, and overall hygiene standards. In the 19th century, these concepts became essential as rapid urbanization and industrialization led to overcrowded cities, which significantly increased the spread of infectious diseases. Improvements in sanitation and public health policies aimed to address these challenges by implementing infrastructure changes, public health regulations, and education on hygiene practices.