Free-living nematodes are microscopic, unsegmented roundworms found in various environments, including soil, freshwater, and marine habitats. They play a crucial role in ecosystems by decomposing organic matter and recycling nutrients, which supports plant growth and soil health. These nematodes are diverse, with thousands of species identified. They feed on bacteria, fungi, and other small organisms, contributing to the balance of microbial communities. Some free-living nematodes are also used in scientific research, particularly in studies related to ecology and soil health.