Here's some more information I pulled from a couple of sites:

Daily active users (DAU) is the total number of users that engage in some way with a web or mobile product on a given day. In most cases, to be considered “active,” users simply have to view or open the product. Web and mobile app businesses typically consider DAU as their primary measure of growth or engagement.

Monthly active users (MAU) is the aggregate sum of daily active users over a period of one month. In most cases, to be considered a “monthly active user,” a person has to open or view an app at least once in the period of one month. The ratio of DAU/MAU is typically a measure of ‘stickiness’ for internet products.

https://amplitude.com/blog/2016/01/1...-active-users/

Perhaps more interestingly:

Of course, the closer to 100% engagement your product has, the better. When it comes to average benchmarks though, the ‘norm’ varies significantly between products, type of engagement, and industry. Look at the DAU/MAU Ratios for companies with a similar type of product or in the same industry.

Sequoia tweeted the standard DAU/MAU ratio is 10-20% with only a handful of companies over 50%.

https://www.geckoboard.com/learn/kpi...dau-mau-ratio/