Phylogeny is the study of the evolutionary history and relationships among organisms. It involves analyzing the genetic, morphological, and behavioral characteristics of different species to determine their evolutionary connections and ancestry. Phylogenetic studies use various techniques, such as molecular sequencing, comparative anatomy, and fossil analysis, to reconstruct the evolutionary tree of life and understand how different species are related to each other. By studying phylogeny, researchers can better understand the diversity of life on Earth and how species have evolved and adapted over time.