Stem Cells are defined as the cells that have the capabilities of self-renewing and divide into multiple cell ancestry. From the early stage of development till the end of life of humans stem cells are found. In all multicellular organisms stem cells are the basic cells and they have the power to differentiate into wide range of adult cells. These cells are amazing since the very beginning of life, a fertilized egg cell divides repeatedly to form a group of stem cells that will go on to eventually make all the organs and tissues in your body. The main feature of stem cell is to differentiate and produce more stem cells & specialised cells such nerve cells.