What technique is described as a 'razor fade'?

The term 'razor fade' specifically refers to a technique used in haircutting where a straight razor is employed to create a seamless blend between different lengths of hair, typically short hair blending into longer hair. This technique is highly regarded for its ability to achieve a softer, more natural look compared to traditional clipper fading methods. The use of a straight razor allows for more precision in shaping and texturizing the hair, which is especially beneficial in creating a stylish and modern fade.

Other options do not accurately describe what a razor fade entails. Methods of dyeing hair, curling hair, or straightening hair do not involve the specific blending technique that the term 'razor fade' represents. Thus, recognizing the specific context of haircutting associated with the razor fade clarifies why this answer is the correct representation of the technique.