Glossary term
What is DAU / MAU (Daily / Monthly Active Users)?
DAU / MAU stands for Daily / Monthly Active Users.
Number of users active per day / month. Example: "10M DAU" is the starting point of most estimates.
Learn it properly · System DesignLesson 10: Back-of-the-Envelope Estimation, Step by StepFive minutes of rough maths tells you whether you need one database or fifty. The numbers worth memorising, a seven-step recipe, and a full worked estimate for a photo-sharing app — with a calculator to try your own.