The spacing effect is a psychological phenomenon that suggests information is better retained when learning sessions are spaced out over time, rather than crammed into a single session. This approach allows for better consolidation of memories, making it easier to recall information later. Research shows that distributing study sessions can enhance long-term retention compared to massed practice. Techniques like using flashcards or reviewing material at intervals can leverage the spacing effect, improving learning outcomes for students and anyone looking to memorize information effectively.