There are different types of stem cells, the most common stem cells are of 4 different types.
1. Embryonic stem cells, these are found in three to five days old embryos.
2. Non embryonic or adult stem cells, these are found in infants and children also and mainly found in the developed organs and tissues of the body.
3. Induced pluripotent stem cells (iPSCs), these stem cells are the adult stem cells which can be induced or reprogrammed to develop into embryonic stem cells.
4. Cord blood stem cells, these are found in the cord blood and amniotic fluid.