Parasitoids are organisms, often insects, that live on or inside a host organism and ultimately kill it. Unlike typical parasites, which may live off their hosts without causing immediate harm, parasitoids have a life cycle that depends on the death of their host. Common examples include certain species of wasps that lay their eggs inside caterpillars or other insects. The relationship between parasitoids and their hosts is complex and can significantly impact ecosystems. By controlling host populations, parasitoids can help regulate pest species, making them important in agriculture and natural environments. Their role in the food web highlights the intricate balance of life in various habitats.