An antioxidant is a substance that helps protect our cells from damage caused by free radicals, which are unstable molecules that can harm our body. Free radicals are produced naturally during processes like metabolism, but they can also come from external sources such as pollution, smoking, and UV radiation. By neutralizing these harmful molecules, antioxidants play a crucial role in maintaining our overall health and may reduce the risk of chronic diseases. Common sources of antioxidants include fruits and vegetables, particularly those rich in vitamins C and E, such as oranges and spinach. Other well-known antioxidants include green tea and dark chocolate. Incorporating these foods into our diet can help boost our body's defenses and promote better health.