Anaerobic respiration is a type of energy production that occurs without the presence of oxygen. It is commonly used by certain organisms, such as yeast and some bacteria, to convert glucose into energy. During this process, glucose is broken down into simpler compounds, resulting in the production of energy, carbon dioxide, and, in some cases, alcohol. This method of respiration is less efficient than aerobic respiration, which requires oxygen and produces more energy. Anaerobic respiration is important in various environments, such as in waterlogged soils or during intense exercise in humans, where oxygen supply may be limited.