Rhizobacteria are a group of beneficial bacteria that live in the soil, particularly in the root zone of plants, known as the rhizosphere. They play a crucial role in promoting plant growth by enhancing nutrient availability, improving soil structure, and protecting plants from pathogens. These bacteria can fix atmospheric nitrogen, making it accessible to plants, which is essential for their development. Additionally, rhizobacteria can produce growth-promoting substances, such as hormones, that stimulate root development. They also help in the degradation of organic matter, contributing to soil health. Overall, rhizobacteria are vital for sustainable agriculture and ecosystem balance.