The sub-field of biology that is concerned with the study of evolutionary processes is referred to as evolutionary biology. The diversity of life on Earth is produced by evolutionary processes such as common descent, natural selection and speciation. Evolutionary biology makes use of principles from various fields like genetics, systematics, palaeontology and ecology. Some of the major sub-fields within this discipline are evolutionary ecology and evolutionary developmental biology. Evolutionary ecology seeks to take the evolutionary history of species as well as their interactions into consideration while studying ecology. Evolutionary developmental biology is involved in the comparison of the developmental processes of different organisms in order to understand the evolution of developmental processes and ancestral relationships between them. This book presents the complex subject of evolutionary biology in the most comprehensible and easy to understand language. Some of the diverse topics covered in this book address the varied branches that fall under this category. It will provide comprehensive knowledge to the readers.