This work portrays production of biofuel from browning oil and emulsification of bio fuel with milk whey which is a component acquired as a result of cheddar making. Biofuel is produced due to completion of transesterification reaction under optimum process condition. Whey is a byproduct of cheddar making and approximately 50% of the total whey which is produced worldwide is normally disposed of without being utilized. The world is running short of fossil fuel due to the increased rate of automobiles and it is vital to meet the growing demands. Hence biofuel is the only alternative. As of late, biofuel has a gigantic potential as a fuel and can possibly diminish the measure of carbon dioxide and nitrogen dioxide discharge which is the reason for an earth wide temperature boost. Biofuel has attracted attention in the past few years as an alternative to fossil fuel. Plants such as sugarcane molasses, corn oil, and vegetable oil are all different sources of biofuel making. Currently, production of biofuel from agricultural residue and food waste is a challenge. Consumption of B100 (biofuel) would create around 10% more NOx (Nitrogen oxide) than oil diesel in light of the fact that the oxygen content in biodiesel increases the formation of nitrogen oxide. Further study in microemulsion of biodiesel with water shows good result in reduction of carbon monoxide. In this paper, a microemulsion strategy is picked as the most ideal choice to produce biodiesel for diesel motor and diminish the emanation of ozone depleting substance. The present review aims to cover the overview, methods and use of making biofuel with a highlight on its benefit.