Description: Nematodes, also known as roundworms, are multicellular organisms belonging to the phylum Nematoda. They are characterized by their elongated, cylindrical bodies, which lack segments, distinguishing them from other types of worms. These invertebrates are extremely diverse and can be found in a wide variety of habitats, including soils, freshwater, and marine environments. Their size varies considerably, ranging from less than a millimeter to several centimeters in length. Nematodes play a crucial role in ecosystems as they contribute to the decomposition of organic matter and nutrient recycling. Additionally, some nematodes are parasites that affect plants and animals, making them a topic of interest in both biology and agriculture. Their study has revealed valuable information about biodiversity and soil health, as well as ecological interactions in different environments. In summary, nematodes are fascinating organisms that, despite their small size, have a significant impact on the environment and agricultural economy.