What is Spaced Repetition?
Definition
Spaced Repetition is a learning technique where material is reviewed at progressively longer intervals over time, based on cognitive science research showing that spacing strengthens long-term retention far more than massed (cramming). Learners encounter the same content multiple times—perhaps after 1 day, then 3 days, then a week—allowing their brain to consolidate memory. This technique underlies flashcard apps and modern adaptive learning systems.
Spaced Repetition at a glance.
Fight Forgetting: The Spacing Effect
Our brains forget—unless we refresh the memory at the right time. Psychologist Hermann Ebbinghaus discovered that forgetting follows a predictable curve; reviewing just before you would forget reinforces memory far better than reviewing when you already remember. Modern learning platforms automate spaced repetition: they track what you learned, predict when you will forget, and send reminders to review. This is why microlearning paired with spaced schedules is so powerful.
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