Monthly Active Users (MAU) is a metric used to measure the number of unique users who actively use an app, website, or platform within a given month. It is a commonly used indicator of the user engagement and popularity of a digital service. The metric is used by many companies to track the growth and success of their product, and to make informed decisions about future development and marketing strategies. The calculation of MAU typically involves tracking the number of unique accounts or devices that have made a request to the service during the past 30 days. The goal for many companies is to have as high an MAU as possible, as it is a strong indicator of customer engagement and loyalty.