First question first.
Hair transplant, in current context, is simply uprooting hair from patches on your head or from the beard where the growth is lush and transplanting these to the graft sites much in the same way that rice farmers lift up paddy saplings and then plant them in soil. However, hair transplant is much more sophisticated, especially the modern technique of hair transplantation.

Currently the techniques most popular and successful are microfollicular hair transplantation, follicular unit extraction and follicular unit transplantation also known as the strip method.

Follicular unit extraction method is by far the better. In this method expert cosmetic surgeons carrying out hair transplant in Dubai extract hair follicles individually and plant them in donor sites. In the follicular unit transplantation techniques they use micro scalpels to remove tissues bearing hair follicles and plant the tissue in a cosmetic surgery process.

The fastest method is known as punch hair matic in which an advanced machine is used in conjunction with a hand held device that automatically extracts hair follicle and the unit is then moved to the donor site and the device implants the follicle in the skin.

Now to the second question as to why hair transplants are best carried out in Dubai.