Insecta, commonly known as insects, is a diverse class of animals within the phylum Arthropoda. They are characterized by having three main body parts: the head, thorax, and abdomen. Insects also have six legs, compound eyes, and often wings, which allow them to fly. This class includes familiar creatures like bees, butterflies, and ants, making up about 75% of all known animal species. Insects play crucial roles in ecosystems, such as pollinating plants, decomposing organic matter, and serving as food for other animals. They can be found in nearly every habitat on Earth, from forests to deserts. Despite their small size, insects are vital for maintaining ecological balance and supporting human agriculture.