Beetles, belonging to the order Coleoptera, are the largest and most diverse group of insects on Earth, with over 350,000 species described so far. They can be found in almost every habitat on the planet, from tropical rainforests to deserts and polar regions. Beetles play important roles in ecosystems as pollinators, predators, scavengers, and decomposers. They are also economically significant, both as pests and beneficial species in agriculture. Research on beetles includes studying their morphology, behavior, ecology, evolution, and interactions with other organisms. Additionally, beetles are important model organisms in fields such as genetics, evolutionary biology, and ecology.