The standard unit for measuring energy is the joule (J). In the International System of Units (SI), one joule is defined as the amount of energy transferred when one newton of force acts over a distance of one meter. Energy can be found in various forms, such as kinetic, potential, thermal, and chemical, and it is crucial in all physical and biological processes. Other units related to energy include calories, kilowatt-hours, and electronvolts, but the joule is the most widely recognized and utilized in scientific contexts.