Developmental biology is the study of the process by which living organisms develop from a single cell (fertilized egg) into mature individuals. It covers the dynamic processes from cell division and differentiation to the formation of tissues, organs, and entire organisms, exploring the mechanisms of embryonic development, cell fate determination, and the principles of morphogenesis. Beyond normal development, it also investigates the mechanisms of developmental abnormalities and related diseases.

Research in developmental biology spans a wide range of levels, from molecular and cellular to tissue and organ levels, aiming to gain a deep understanding of the mechanisms of development, the regulation of cell behavior, and the pathology of developmental abnormalities. Key research areas include embryonic development, cell differentiation, morphogenesis, tissue and organ formation, the relationship between development and disease, and evolutionary development.