What does a "fade" haircut refer to?

A "fade" haircut specifically refers to a hairstyle that transitions smoothly from longer hair on the top to shorter lengths on the sides and back. This gradual shortening creates a blended effect, which is visually appealing and is a popular choice in various styles, including both men's and women's haircuts. The fade can vary in length and can be blended into stubble or skin, adding versatility to the style.

The other options do not accurately define a fade haircut. For instance, a haircut with long hair on the top and short hair on the sides does not emphasize the gradual blending characteristic of a fade. A uniform length haircut lacks the gradation essential to creating a fade, as every part would be cut to the same length. Lastly, a haircut with sharp edges and defined lines suggests a more structured cut rather than the soft and blended nature of a fade, which aims for a seamless transition without harsh lines.