When I attend esthetician school, I've learned a lot about hair removal techniques and methods.
Hair follicle
A hair follicle is a stocking-like structure that contains several layers with different jobs. The hair follicle can be recognized as a separate entity within the skin with formation and maintenance based on interaction between dermal and epidermal components.
Hair papilla
The papilla is the very bottom portion of the hair follicle that contains the blood supply and the matrix. The matrix consists of cells that actually form the hair shaft. The papilla is active during the anagen phase, is separated from the hair shaft during the catagen phase, and is completely inactive during the telogen phase.