Invertebrates are a diverse group of animals that lack a backbone. They make up about 95% of all animal species on Earth, including familiar creatures like insects, spiders, and octopuses. These animals inhabit various environments, from deep oceans to lush forests, showcasing incredible adaptations and survival strategies. Despite their lack of a spine, invertebrates play crucial roles in ecosystems. They contribute to pollination, decomposition, and serve as a food source for many vertebrates. Understanding invertebrates is essential for biodiversity conservation and maintaining ecological balance.