Soap is a cleaning substance that helps wash away dirt and germs from your skin, clothes, and other surfaces. When you lather up your hands with soap and water, the soap molecules grab onto both the water and the oily dirt on your skin, allowing everything to rinse away together.

People have made soap for thousands of years by mixing fats or oils with an alkaline substance, traditionally wood ash. Today's soap comes in bars, liquids, and foams, often with added scents and colors. Different types of soap serve different purposes: gentle hand soap for daily washing, stronger dish soap for cutting through grease on plates, and laundry soap for cleaning clothes.

The word soap also refers to soap operas, a type of melodramatic television show. These programs got their unusual name because soap companies sponsored the first radio dramas like this in the 1930s, advertising their products during the broadcasts. When someone says a situation is getting soap opera-like, they mean it's becoming overly dramatic.

Whether you're washing your hands before dinner or scrubbing mud off your bike, soap makes cleaning possible by breaking down oils and grime that plain water can't remove on its own.