Rapid industrialization and growth in population has resulted in the rapid increase in energy demand. Indiscriminate use of fossil fuels has led to extinction of petroleum sources. Pollutant emissions from diesel engines has caused major impacts in disturbing the ecological system. To overcome these problems, focus is towards alternative sources. Biodiesel, derived from vegetable oils, animal fats and algae is the future prospect. The paper reviews the research on impact of biodiesel on performance. Fuel properties like calorific value, flash point and cetane value of biodiesel and biodiesel blends B5,B15,B25 were found comparable petroleum diesel. Performance results reveal that most of the biodiesel, give higher brake thermal efficiency and lower brake specific fuel consumption J Mahendran "Performance and Emission Characteristics of Biodiesel From Algae in A Diesel Engine" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: https://www.ijtsrd.com/papers/ijtsrd15716.pdf