Renewable isobutanol is produced through the fermentation of biomass, such as sugars or starches, by specific microorganisms. This process converts the biomass into isobutanol, a four-carbon alcohol that can be derived from renewable resources. Isobutanol can be used as a biofuel, a solvent, or a chemical intermediate in the production of various chemicals and plastics. It has a higher energy content than ethanol, making it a more efficient fuel option. Additionally, it can be blended with gasoline or used in existing engines without significant modifications.