Insect evolution is the branch of biology that studies the evolutionary history and relationships of insects, which are the most diverse and abundant group of animals on Earth. This field of research considers how insects have evolved over millions of years, including their adaptations to different environments, their development of specialized features for feeding, defense, and reproduction, and their relationships with other organisms. Research in insect evolution also explores the genetic and molecular mechanisms that drive evolutionary changes in insects, as well as the role of insects in shaping the evolution of other organisms and ecosystems.