Stem cells are undifferentiated cell type characterized by colonogenic ability, self-renewal and multi-lineage differentiation. They are classified into the following categories: embryonic stem cells [ESC], somatic stem cells [or adult stem cells] and induced pluripotent stem cells [iPSC]. Stem cells represent area of interest for wide range of scientists, as they are promising tool for regenerative therapy. Their differentiation ability is significantly affected by various factors of the local environment. Additional research will provide more information about the optimal cell culture conditions when stem cells are cultivated for clinical purpose, to avoid side effects like uncontrolled cell proliferation and premature differentiation.