Why do we have eyebrows?
The Real Answer
Eyebrows serve two main purposes. Physically, they divert sweat and rain away from your eyes — the arch shape channels liquid to the sides of your face. Socially, they're critical for nonverbal communication. Studies show people have more difficulty recognizing faces without eyebrows than without eyes, which suggests eyebrows are a bigger part of your identity than you'd expect.
Your face has two tiny awnings installed above your eyes, and they're doing more work than most people do at their actual jobs. Remove them and your own mother would walk past you at the grocery store.
Why People Ask This
People usually land on this question after plucking, waxing, or seeing someone without eyebrows and realizing how dramatically it changes a face. The MIT study about eyebrow recognition genuinely surprised researchers — nobody expected eyebrows to matter more than eyes for identifying people.