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Cnidarians are a phylum of aquatic invertebrates known for their distinct radial symmetry and unique feeding structures called nematocysts, which they use to capture prey. These animals can be found in both marine and freshwater environments, and while they are often grouped with other types of marine life, they are not plants but rather animals that obtain their nutrients through heterotrophic means. Cnidarians include a diverse range of species, such as jellyfish, sea anemones, corals, and hydroids, which can be found in various sizes, shapes, and habitats. Despite their simple body structure, cnidarians exhibit complex behaviors and play crucial roles in marine ecosystems as both predators and symbiotic partners with other organisms.