Which tool is primarily used for fading hair?

The tool primarily used for fading hair is the clipper. Clippers are designed with blades that can quickly and efficiently cut hair at varying lengths, which is essential for creating gradual transitions in length that define a fade haircut. By adjusting the guard size or using different techniques, a barber can create soft lines and a blended look, which are the hallmarks of an effective fade.

While trimmers are useful for detailing and refining the edges of a fade, they typically do not provide the same versatility needed for the broader, transitional sections of a fade. Scissors are generally used for cutting lengths and texturizing rather than for creating the gradual change in length required for a fade. Razors might be used for finishing touches or texturizing but are not the primary tool for achieving the fade itself.

In summary, clippers are the most effective tool for achieving the smooth blends and gradations required in fade haircuts, making them the correct choice in this context.