This book provides comprehensive insights into the field of stem cell biology. Stem cells refer to the undifferentiated biological cells that can divide themselves through mitosis to form more stem cells. These cells are generally seen in multicellular organisms and are of two types, namely, embryonic stem cells and adult stem cells. They are found in embryos, fetuses and some adult tissues. This book unravels the recent studies in the field of stem cells. It will also provide interesting topics for research which readers can take up. From theories to research to practical applications, case studies from across the globe related to stem cell biology, have been included in this book. Students, scientists, biologists, doctors and other interested readers will benefit alike from this text.