Antioxidants are molecules that inhibit the oxidation of other molecules. Oxidation is a chemical process that can produce free radicals, leading to chain reactions that may cause damage to our cells.
Every day, oxidation in your body attacks billions of cells similar to how it spoils foods. Antioxidants job is to help protect our bodies from the ravages caused by oxidation, like it inhibits rancidity and spoilage in foods.