E10 is a type of fuel that contains 10% ethanol and 90% gasoline. Ethanol is a renewable biofuel made from plants, such as corn or sugarcane, which helps reduce greenhouse gas emissions compared to traditional gasoline. E10 is commonly used in many vehicles and is often available at gas stations. Using E10 can help support local agriculture and reduce dependence on fossil fuels. However, not all vehicles are compatible with E10, so it's important for drivers to check their owner's manual. Some older engines may experience issues with this blend, making it essential to ensure compatibility before use.