Retention curves are graphical representations of user retention over a period of time. In product management, retention curves help us understand how well our product is retaining users and how quickly they are dropping off. Just like a roller coaster, retention curves show us the ups and downs of user engagement. They allow us to identify the key points where users lose interest or stop using our product. By analyzing retention curves, we can make data-driven decisions to improve user retention and drive long-term customer success.