Biofertilizers are substances that contain living microorganisms that promote plant growth by increasing the supply or availability of essential nutrients to the plants. They can be applied to seeds, plant surfaces, or soil, and when used, they colonize the rhizosphere or the interior of the plant, promoting growth by controlling the quantity or availability of primary nutrients to the plant host. Biofertilizers add nutrients through natural processes such as nitrogen fixation, solubilizing phosphorus, and stimulating plant growth through the synthesis of growth-promoting substances. The microorganisms in biofertilizers restore the soils natural nutrient cycle and build soil organic matter. Biofertilizers are eco-friendly and cost-effective, and they protect the environment from pollutants since they are natural fertilizers. They are also proved to be effective even under semi-arid conditions. Some of the most commonly used microorganisms in biofertilizers include mycorrhizal fungi, blue-green algae, and bacteria. Biofertilizers are required to restore the fertility of the soil, and they are the natural form of fertilizers, hence widely used in agriculture.