Jellyfish are fascinating marine animals known for their gelatinous bodies and unique movement. They belong to the phylum Cnidaria and are primarily composed of water. Jellyfish have tentacles equipped with stinging cells called nematocysts, which they use for capturing prey and defense. They can be found in oceans worldwide, from surface waters to deep seas. Some species are bioluminescent, emitting light in dark waters. Despite their simplicity, jellyfish play important roles in marine ecosystems.
