Retention is a critical concept in product management but often misunderstood, with many defining it incorrectly as a daily/weekly/active user metric.A good retention metric should focus on the value users derive from the product over time, not just their usage frequency.Defining retention based on natural frequency of use and value generation is crucial for a meaningful metric.Different products have different usage frequencies, so retention metrics should align with how often the problem your product solves occurs.Key actions that indicate value should be tracked to ensure the retention metric reflects meaningful interactions.Combining natural frequency of use with key value-generating actions creates a truly actionable retention metric.For ad-hoc products used infrequently, defining a retention metric may not make sense as building habits around them is challenging.Strategies for ad-hoc products include focusing on brand awareness or developing more frequently used products to drive retention.Properly defined retention metrics help evaluate habit-building features and gauge the product's effectiveness in solving user problems.Retention should be measured as an indicator of habit formation, not just for the sake of tracking metrics.