Plant Growth-Promoting Bacteria (PGPB) are beneficial microorganisms that enhance plant growth by various mechanisms. They can improve nutrient availability, promote root development, and increase resistance to diseases. These bacteria often colonize plant roots, forming a symbiotic relationship that supports plant health. PGPB can produce hormones, such as auxins, which stimulate root growth, and solubilize essential nutrients like phosphorus, making them more accessible to plants. By enhancing soil fertility and promoting a healthy root system, these bacteria play a crucial role in sustainable agriculture and can help improve crop yields.