DAU is a metric used to measure the number of unique users who interact with an app or website on a given day.

Daily Active User (DAU) is a metric used in product management to measure the number of unique users who interact with a product on a daily basis. It is an important metric for understanding user engagement and retention, as it provides insight into how many people are using the product on a regular basis. DAU can be used to measure the success of product features, identify areas of improvement, and track user growth over time. Additionally, DAU can be used to compare usage across different platforms or versions of the same product.

1. A mobile game developer tracking the number of players who log in to their game each day. 2. An e-commerce website tracking the number of customers who make a purchase each day. 3. A social media platform tracking the number of users who post content or interact with other users each day. 4. An online streaming service tracking the number of subscribers who watch content each day.