Ever watch “Law and Order”? As the narrator tells us each week, the people are represented by two separate yet equally important groups: The police, who investigate crime, and the district attorneys, who prosecute the offenders. They’re two unique, yet intertwined forces working together toward a common goal.

If you don’t know the difference between UI (user interface) and UX (user experience), their symbiotic relationship is much the same. UX designers are the analytical, technical ones, working to make sure the structure of an app or website is sound. Meanwhile, UI designers are the cosmetic, emotional ones, focused on how that same product looks and feels for a user.