Nitrogen fixation is a natural process that converts atmospheric nitrogen (N₂) into a form that plants can use, such as ammonia (NH₃). This process is essential because most plants cannot utilize nitrogen in its gaseous form. Nitrogen fixation occurs through various methods, including biological fixation by certain bacteria and archaea, as well as through industrial processes. In nature, specific bacteria, often found in the root nodules of legumes like peas and beans, play a crucial role in nitrogen fixation. These bacteria convert nitrogen gas into ammonia, which plants can absorb and use to grow. This process not only supports plant life but also enriches the soil, promoting healthy ecosystems.