Monthly Active Users (MAU) refers to the number of unique users who engage with a product or service within a month. This metric is commonly used by companies, especially in the tech and social media sectors, to measure user engagement and growth. It helps businesses understand how many people are actively using their platform, which can inform marketing strategies and product development. Tracking MAU is essential for assessing the health of a business. A rising MAU indicates increasing user interest and potential revenue growth, while a declining MAU may signal issues that need addressing. Companies like Facebook and Twitter often report their MAU figures to investors to showcase their performance.