The use of biodiesel worldwide is becoming increasingly important, because of the widespread shortage of oil resources, which has raised the prices of fossil fuels. This biofuel also offers an opportunity to meet the energy demands with less impact to the environment due its renewable characteristics. This book entitled "Biodiesel – Quality, Emissions and By-Products" comprises 20 chapters and covers topics related to biodiesel quality, performance of combustion engines that use biodiesel, and the emissions they generate. It emphasizes the applications of glycerol, a byproduct of biodiesel production process. It is divided in three sections: i) Biodiesel Quality and Standards, ii) Biodiesel: Development, Performance and Combustion Emissions, and iii).