A hair transplant is a surgical procedure that involves taking hair from one area of the head and transplanting it to another area. The most common type of hair transplant is called follicular unit hair transplantation, which involves taking hair from the back and sides of the head and transplanting it to the balding or thinning areas. During the procedure, the hair follicles are carefully removed from the donor site and then transplanted to the recipient site. The hair follicles are then allowed to grow and produce new hair. In most cases, hair transplants are considered to be safe and effective, and they can produce long-lasting results.