Monkeys are primates that belong to the infraorder Simiiformes. They are known for their intelligence, social behavior, and ability to use tools. Monkeys are typically divided into two groups: New World monkeys, found in the Americas, and Old World monkeys, found in Africa and Asia. They have a wide range of habitats, including forests, savannas, and mountains. Most monkeys are characterized by their long limbs, prehensile tails, and expressive faces. They live in social groups called troops, which help them find food and protect each other from predators. Monkeys primarily eat fruits, leaves, and insects, making them important for their ecosystems.