Stem cells are undifferentiated progenitor cells that have the capacity to renew themselves for a long time and can differentiate with certain signals.

Differentiation results in the formation of specialized functional cells and usually proceeds through the production of daughter cells of more limited potential.

Importantly, stem cell populations inhabit,specific environments (niches) where cellular and extracellular signals can be integrated,where they can coordinate andmaintain stem cell function.

In summary, stem cells are cells;

• capable of renewing itself by dividing,
  
• differentiate into different cell types,
• precursor,

which can migrate to specific areas in the body.

There are many different types of stem cells obtained from different parts of the body.

There are many different types of stem cells obtained from different parts of the body.Differentiation potential of each stem cell type is different from each other.

To meet a specific purpose in the body, that tissue-specific stem cell type is used. Tissue-specific stem cells are limited in their potential and are usually able to differentiate into cell types where they are found.(For example, blood-producing stem cells found in the bone marrow(hematopoietic stem cells) provide blood regeneration, while neural stem cells form neurons in the brain.

Therefore, rather than the advantages of stem cells over each other, it is important to respond to patients' diseases with the selection and use of the right type of stem cells that will treat these disorders in the most advantageous way. Stem cells obtained from various tissues and organs play a role in the regeneration of damaged or dysfunctional tissues and organs.