Undifferentiated, or "blank," cells are stem cells. This means they can develop into cells that perform a variety of activities in various places of the body. Differentiated cells make up the majority of the body's cells. Stem cells are cells that have not yet developed into other types of cells. They have the power to divide and reproduce themselves in an infinite number of ways. These cells can exclusively fulfil a single function in a single organ. Stem-cell research is the study of the qualities of stem cells and their potential applications in medicine. Comprehension of the qualities of stem cells, which are the source of all tissues, aids our understanding of the development and homeostasis of the healthy and diseased body.