An oxidizing agent is a substance that facilitates oxidation in a chemical reaction by accepting electrons from another substance. This process often results in the oxidizing agent being reduced itself. Common examples of oxidizing agents include oxygen, chlorine, and potassium permanganate. In redox reactions, the oxidizing agent plays a crucial role in determining the flow of electrons. When it gains electrons, it causes another substance to lose electrons, leading to its oxidation. Understanding oxidizing agents is essential in various fields, including chemistry, biochemistry, and environmental science.