Frankia is a genus of nitrogen-fixing bacteria that forms symbiotic relationships with certain plants, particularly those in the Frankiaceae family. These bacteria are essential for enriching soil with nitrogen, which is a vital nutrient for plant growth. They typically associate with the roots of host plants, creating nodules where the nitrogen fixation process occurs. This genus is commonly found in various ecosystems, including forests and grasslands. Frankia plays a crucial role in sustainable agriculture and natural ecosystems by improving soil fertility and supporting plant health. Its ability to fix atmospheric nitrogen makes it an important player in the nitrogen cycle.