Sanitation is the systems and practices that keep communities clean and healthy by safely managing human waste, garbage, and dirty water. When a city has good sanitation, toilets connect to sewers that carry waste away from homes, trash gets collected regularly, and clean water flows from taps.

For most of human history, poor sanitation caused devastating diseases. When waste contaminated drinking water, illnesses like cholera and typhoid could kill thousands. Cities smelled terrible, and people got sick constantly. The development of modern sanitation systems in the 1800s, with underground sewers and water treatment plants, saved more lives than almost any other invention in history.

Today, sanitation workers collect garbage, maintain sewer systems, and keep cities clean. A sanitary environment is one that's clean and free from dangerous germs. In a restaurant kitchen, health inspectors check sanitary conditions to make sure food is prepared safely.

Around the world, billions of people still lack proper sanitation, which remains one of the biggest challenges in global health. Communities with good sanitation are healthier, cleaner, and more pleasant places to live. The unglamorous work of managing waste and keeping things clean turns out to be absolutely essential to human civilization.