Retention refers to the ability of an organization or individual to keep customers, employees, or information over time. In business, high retention rates indicate that customers are satisfied and likely to continue using a product or service. This is crucial for long-term success, as acquiring new customers can be more expensive than maintaining existing ones. In the context of education, retention can describe a student's ability to remember and apply learned information. Effective teaching strategies, such as active learning and regular review, can enhance retention. This is important for academic success and helps students build a strong foundation for future learning.