Oxidation reactions involve the loss of electrons from a substance, often resulting in an increase in its oxidation state. These reactions are fundamental in various chemical processes, including combustion, respiration, and corrosion. For example, when iron reacts with oxygen, it forms rust, which is an oxidation process. In many oxidation reactions, another substance gains the electrons that are lost, a process known as reduction. Together, oxidation and reduction are referred to as redox reactions. These reactions are essential in energy production, such as in batteries and biological systems, where they help convert energy from food into usable forms.