Insects are a type of arthropod with six legs and a hard outer covering. They have a body divided into three parts, eyes made of many lenses, and two feelers. They are the most varied and numerous animals, with more than a million kinds. Insects have many functions in nature and for people, such as helping plants reproduce, breaking down organic matter, eating other animals, living on or in them, causing harm or benefit, and providing food, products, and remedies.