Retention rate refers to the percentage of customers or users who continue using a product, service, or platform over time. It is an important metric for businesses and organizations to measure customer satisfaction and loyalty, as well as overall engagement with their offerings. Retention rates can be calculated by comparing the number of active users at a specific point in time to the total number of users who were active at some previous point in time. The percentage difference between these two numbers represents the retention rate for that period. Higher retention rates indicate that more customers are continuing to use and engage with a product or service, while lower rates suggest that there may be issues with customer satisfaction or engagement.