Threading is a hair removal technique that originated in the Middle East and involves using a thread to pluck out individual hairs from the roots, creating clean and precise lines. It is generally less painful than waxing or plucking and can be used on any area of the face, including the eyebrows, upper lip, chin, and cheeks. Threading can last anywhere from 2 to 4 weeks, depending on the individual's hair growth rate, and is recommended every 2 to 4 weeks to keep the skin smooth and hair-free.