Embryology is the branch of biology that deals with the study of the development of an embryo from the fertilization of the egg to the fetus stage. It involves studying the complex processes of cell division, differentiation, and morphogenesis that occur during embryonic development. Researchers in the field of embryology aim to understand how organisms develop from a single fertilized egg into a complex multicellular organism. This area of research is crucial for understanding the underlying mechanisms of growth and development, as well as for studying congenital disorders and birth defects.