Embryology is the branch of biology that studies the development of embryos from fertilization to birth or hatching. It is an important field of study as it helps us to understand the processes and mechanisms involved in the formation and growth of an organism. Embryology provides insights into the molecular and cellular mechanisms that underlie normal and abnormal development, which can be applied to the diagnosis and treatment of various developmental disorders. Additionally, embryology is essential to fields such as reproductive medicine, genetics, and evolutionary biology.