On a basic level, hair transplant techniques mainly being performed are two
Follicular Unit Extraction (FUE) and
Follicular Unit Transplantation (FUT)
In FUE Unit wise or each hair follicle wise some of the hair being taken out from the healthy grown area (referred as donor site) and then implanted on hair loss area. So the density of the hair changes in both the places.
Things to note in FUE procedure are