Bio-fertilizers are the ones produced from living microorganisms which improve soil fertility and stimulus to plant growth as natural way. These are differentiated into three characteristic i.e. bacterial (Rhizobium, Azotobacter), fungal (mycorrhizae), and algal (green-blue algae). They fix atmospheric nitrogen, solubilize phosphates and decompose organic matter, making nutrients more accessible to plants. Bio-fertilizers can hold a number of advantages, including better soil health, higher crop productivity, and decrease in reliance on fertilizers that can have an adverse affect on the surrounding habitat. They help foster sustainable agriculture because they enhance soil biodiversity and resilience. Bio-fertilizers are inexpensive and can be produced at a local level and becliboe is available to small-scale farmers.