Bioenergy is a type of renewable energy that is derived from plants and animals. The biomass that is used as input materials consists of recently living organisms, mainly plants. Thus, fossil fuels are not regarded as biomass under this definition. Types of biomass commonly used for bioenergy include wood, food crops such as corn, energy crops and waste from forests, yards, or farms. Bioenergy can also refer to electricity generated from the photosynthesis of living organisms, typically using microbial fuel cells and biological photovoltaics.