Threading for eyebrows is widely practiced in India. Indian women generally have their eyebrows done every three weeks. Threading is also used for full face, upper lip, chin, sideburns and cheeks.
In threading, a thin (cotton or polyester) thread is doubled, then twisted. It is then rolled over areas of unwanted hair, plucking the hair at the follicle level. Unlike tweezing, where single hairs are pulled out one at a time, threading can remove short lines of hair.
Advantages cited for eyebrow threading, as opposed to eyebrow waxing, are that it provides more precise control in shaping eyebrows and is gentler on the skin and less painful.
My niece, Ashley, went to have her eyebrows groomed and was a bit startled when the stylist had a spool of thread in her hand. She expected her brows to be waxed. Ashley was hesitant but decided to give threading a try. Once I saw how great her brows looked I wanted to try it too. During the procedure I felt a vibration like sensation and some discomfort but nothing like waxing. My skin was pink for about 15 minutes afterward and then went back to normal. Below is a video of me having my eyebrows threaded if you’d like to see the process.
Source: Wikipedia https://en.wikipedia.org/wiki/Threading_(epilation)