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Insects are small invertebrate animals belonging to the class Insecta, characterized by having a chitinous exoskeleton, a three-part body (head, thorax, and abdomen), and three pairs of legs. They have a diverse range of forms and functions, with various species adapted for life in different environments such as land, water, or air. Insects play crucial roles in ecosystems, including pollination, decomposition, and natural pest control. Some insects are also beneficial to humans as sources of food, medicine, and other products. However, some species can be harmful, causing damage to crops, spreading diseases, or becoming household pests. Overall, the category "Insects" encompasses a vast array of creatures with fascinating biology, ecological importance, and cultural significance.