Parasitoids are organisms that live in or on a host organism and ultimately kill it as part of their life cycle. They are typically insects, but can also include certain species of wasps, flies, and mites. Parasitoids are a common form of biological control in agriculture, as they can help control pest populations naturally without the need for chemical pesticides. They are often used in integrated pest management programs to reduce the reliance on synthetic chemicals and promote sustainable agriculture practices. Parasitoids can be highly specialized and target specific host species, making them an effective and environmentally friendly tool for pest management.