The DAU:MAU Ratio measures engagement frequency and therefore the stickiness of your product. If you want to increase engagement, it is a good metric to track your success.
Note: Monthly average DAU is the average of Daily Active Users in a month.
The DAU:MAU Ratio is calculated by dividing daily active users by monthly active users.
On average a company has 100 (unique) active users per day and 1.000 (unique) active users per month.