Genetic engineering of algae for enhanced biofuel production involves modifying lipid, alcohol, hydrocarbon, and polysaccharide accumulation in photosynthetic organisms, yeast, and bacteria. Microalgae, with their high photosynthetic efficiency, diverse metabolism, and ability to store energy-rich compounds like triacylglycerol (TAG) and starch, are promising biofuel candidates. Recent advances in genetic tools have enabled manipulation of central carbon metabolism in microalgae, potentially improving biofuel production. However, challenges remain, including efficient biomass harvesting, large-scale cultivation, and biofuel extraction. Genetic engineering aims to optimize microalgal cultivation systems and identify strains with desirable biofuel traits. Microalgae can produce biohydrogen, starch-derived alcohols, diesel surrogates, and alkanes. Genetic engineering strategies include enhancing lipid metabolism, modifying fatty acid characteristics, and improving secretion of biofuels like TAG, alkanes, and free fatty acids. Advances in microalgal genomics and transformation methods have enabled the development of genetic tools for biofuel production. Strategies to increase lipid content include overexpression of genes involved in fatty acid synthesis and TAG assembly, while inhibiting lipid catabolism can enhance storage. Genetic modification of carbohydrate metabolism can also improve biofuel production by increasing glucan storage. Overall, genetic engineering of microalgae holds promise for enhancing biofuel production, but further research is needed to overcome technical barriers and optimize biofuel yields.Genetic engineering of algae for enhanced biofuel production involves modifying lipid, alcohol, hydrocarbon, and polysaccharide accumulation in photosynthetic organisms, yeast, and bacteria. Microalgae, with their high photosynthetic efficiency, diverse metabolism, and ability to store energy-rich compounds like triacylglycerol (TAG) and starch, are promising biofuel candidates. Recent advances in genetic tools have enabled manipulation of central carbon metabolism in microalgae, potentially improving biofuel production. However, challenges remain, including efficient biomass harvesting, large-scale cultivation, and biofuel extraction. Genetic engineering aims to optimize microalgal cultivation systems and identify strains with desirable biofuel traits. Microalgae can produce biohydrogen, starch-derived alcohols, diesel surrogates, and alkanes. Genetic engineering strategies include enhancing lipid metabolism, modifying fatty acid characteristics, and improving secretion of biofuels like TAG, alkanes, and free fatty acids. Advances in microalgal genomics and transformation methods have enabled the development of genetic tools for biofuel production. Strategies to increase lipid content include overexpression of genes involved in fatty acid synthesis and TAG assembly, while inhibiting lipid catabolism can enhance storage. Genetic modification of carbohydrate metabolism can also improve biofuel production by increasing glucan storage. Overall, genetic engineering of microalgae holds promise for enhancing biofuel production, but further research is needed to overcome technical barriers and optimize biofuel yields.