Bleach is a powerful chemical that removes color and kills germs. When you spill grape juice on a white shirt, regular soap might not get the purple stain out, but bleach can break down the colored molecules and make the fabric white again. It works by chemically destroying the pigments that give things their color.

People use bleach in two main ways. First, for cleaning and disinfecting: a small amount of bleach mixed with water can kill bacteria and viruses on surfaces like kitchen counters or bathroom floors. Second, for whitening: adding bleach to a load of white laundry helps keep white clothes bright instead of dingy. Hair stylists also use special bleach to lighten someone's hair color.

Bleach is useful but dangerous if misused. It can burn skin, damage eyes, and create toxic fumes if mixed with other cleaners like ammonia. That's why adults handle it carefully, dilute it with water when needed, and keep it away from children. The strong, sharp smell of bleach is unmistakable: you've probably caught a whiff when walking past a freshly cleaned bathroom.

As a verb, the word can also mean making something paler through exposure to sunlight. Old photographs left in a sunny window become bleached and faded over time.