What does "average DAU" mean and how is it calculated?
Average Daily Active Users (DAU) is the sum of the unique users that play each of your games each day in a given calendar month, divided by the number of days in that month. For example, if 10,000 users played your game in a 30-day month, then your average DAU for that game would be just over 300 (334).
What is meant by "unique" user?
If the same user plays your same game multiple times in a day, that counts as one user for that game for that day, regardless of how many times they play it in a given day.
Note that the total number of users in a given month do not rollover to the next month - each month resets to zero at the beginning.