Biofuel cells are devices that convert the chemical energy from biological materials into electrical energy. They use enzymes or microorganisms to break down organic substances, such as sugars or fats, producing electrons in the process. This reaction generates electricity, making biofuel cells a promising alternative energy source. These cells are often considered environmentally friendly because they can utilize renewable resources and produce less pollution compared to traditional fossil fuels. Research is ongoing to improve their efficiency and make them more practical for applications like powering small electronic devices or even vehicles, contributing to sustainable energy solutions.