Biodesulfurization is a biological process that removes sulfur compounds from fossil fuels, such as coal and oil. This method uses microorganisms, like bacteria, to convert harmful sulfur compounds into less harmful substances. By doing so, it helps reduce sulfur emissions when these fuels are burned, which can contribute to air pollution and acid rain. This process is considered an environmentally friendly alternative to traditional methods of sulfur removal, which often involve harsh chemicals. Biodesulfurization not only helps in producing cleaner fuels but also supports efforts to meet stricter environmental regulations and promote sustainable energy practices.