Threading is a method of hair removal believed to have originated in Asia (middle eastern countries).In more recent times it has gained popularity in Western countries, especially with a cosmetic application (particularly for removing/shaping eyebrows). In threading, a thin (cotton or polyester) thread is doubled, then twisted. It is then rolled over areas of unwanted hair, removing the hair at the follicle level.
The advantage of threading, as opposed to eyebrow waxing, is that it provides more precise control in shaping eyebrows and is gentler on the skin. It can be painful as several hairs are removed at once; however this can be minimized if it is done correctly.
Threading allows for a more defined and precise shape and can create better definition for eyebrows. It is also used as a method of removing unwanted hair on the entire face and upper lip area. Threading is not a good method for removing hair on arms or legs, as the hair in those regions is typically quite coarse and there is too much to be removed.