Stem cells have an intersting history,it traces from mid of 1800 to the date , and it remains the most controversial issue of research even today.The ability of stem cells to self- renew and give rise to generations with variable degrees of differentiation capacities, ofers significant potential for generation of tissues that can replace diseased and damaged ones

Aim of the work:to clarify diferent types and sources of stem cells and their potential uses to treat many diseases.

Conclusion:The potency of the stem cell specifies the differentiation potential and is an important factor that is responsable for the characteristic nature of the stem cells because of this tissue renwing capacity,stem cell researchers are now one of the important cornerstones for medical research and development