Entomology is the scientific study of insects. Insects are the dominant animal life form on earth. They make up more than 80 percent of all described animal species. Insects have a huge impact on our lives. They are a critical part of the ecosystems that support human life. We depend on pollinators and other beneficial insects for food production, natural pest control, and waste decomposition. But, insects also cause billions of dollars in yearly losses to crops, stored products, forests, and buildings. Insect pests affect millions of people worldwide with diseases, causing illness or even death.