Which tool is primarily used for cutting hair?

Shears or scissors are primarily used for cutting hair due to their design, which allows for precise control and various cutting techniques. Unlike other tools, shears are specifically crafted for hair cutting, featuring sharp blades that can create clean lines and layers. Their versatility makes them essential in a stylist's toolkit, allowing for different cutting styles such as blunt cuts, texture cuts, and point cuts. This precision is crucial for achieving the desired haircut and styling effects, providing both detailed and broad cutting capabilities.

While razors, clippers, and combs each have their own functions in hair styling and cutting, they do not replace the fundamental role that shears or scissors play in haircutting. Razors may be used for specific effects like adding texture, clippers are generally for shorter cuts or fades, and combs are primarily a styling and sectioning tool rather than a cutting implement.