Which method of hair removal is known for requiring a machine or device to assist in the process?

Electrolysis is a method of hair removal that specifically requires a machine to assist in the process. This technique utilizes an electrical current delivered through a fine needle to destroy the hair follicle, preventing future hair growth. The device used in electrolysis is essential for accurately delivering the current to each individual hair follicle, making it a precise and effective method for permanent hair removal.

In contrast, threading is a manual technique that involves using a twisted thread to remove hair, and it does not require any machinery. Waxing, while also effective for hair removal, involves the application of wax to the skin to remove hair from the root and is performed using manual techniques rather than mechanical devices. Shaving is typically done with a razor or electric shaver, but it does not involve the same level of technology or procedure associated with electrolysis, and it temporarily removes hair rather than providing a permanent solution.