1. Digestion: Bacteria in our gut help us break down food, especially fiber, that our bodies can't digest on their own. This process releases essential nutrients and vitamins.

2. Food Production: Bacteria are used to create a wide variety of foods we enjoy, including yogurt, cheese, sauerkraut, and even bread. They play a key role in fermentation, which changes the flavor and texture of these foods.

3. Bioremediation: Some bacteria can break down pollutants and toxins in the environment. This process, known as bioremediation, can help clean up contaminated soil and water.