What does the term "undercut" refer to in the context of haircutting?

The term "undercut" specifically refers to a hairstyle where the hair on the top of the head is left long while the sides and back are cut very short. This technique creates a notable contrast between the longer hair on top and the shorter hair beneath, allowing for various styling options and adding a modern edge to the haircut. It is often seen in contemporary styles, providing versatility in how the longer hair can be styled—either slicked back, textured, or allowed to fall naturally.

Other options do not accurately describe the concept of an undercut. Styling the hair with gel pertains to how the hair is finished rather than the cutting technique itself, cutting the hair in a straight line describes a different method of cutting without any layering or texturing, and shaving the hair down to the scalp represents a completely different style that eliminates hair rather than creating the distinct contrast characteristic of an undercut.