How is an 'undercut' defined in barbering?

An 'undercut' in barbering is characterized by having the sides and back of the hair cut significantly shorter than the hair on the top. This style creates a stark contrast between the lengths, allowing the longer hair on top to stand out dramatically. The technique often includes shaving or trimming the hair on the sides and back close to the scalp, which can add texture and volume to the longer hair above.

This distinct boundary between short and long hair is what defines the undercut, making it a popular choice for many modern haircuts. In this style, the longer hair on top can be styled in various ways, such as slicked back, textured, or even left messy, showcasing versatility. The focus of the undercut is truly on that contrast in length, which is why it fits this definition so well.