Energy classification refers to the systematic categorization of different forms of energy based on their characteristics and sources. The main types include kinetic energy, potential energy, thermal energy, chemical energy, and nuclear energy. Each type has unique properties and applications, making it essential for understanding energy use in various fields. Additionally, energy can be classified as renewable or non-renewable. Renewable energy sources, such as solar energy and wind energy, are naturally replenished, while non-renewable energy sources, like coal and natural gas, are finite and can deplete over time. This classification helps in assessing sustainability and environmental impact.