Meaning:
Short for “日活用户,” this term is the translation of “daily active users” (DAU). Most DAU calculations consider a user to be any unique visitor who has downloaded an app or accessed a site and takes an action.
Example:
A: 你平时有空会刷抖音吗？
Nǐ píngshí yǒukòng huì shuā dǒuyīn ma？
Do you check out stuff on Douyin in your leisure time?
B: 没有，但周围很多人每天都刷这个应用。
Méiyǒu，dàn zhōuwéi hěnduō rén měitiān dōu shuā zhè gè yīngyòng。
Not really. But I know a lot of people who use the app daily.
A: 真是难以置信，根据他们的官方数据，从去年年初到今年年初，抖音国内的日活从3千万增长到2.5亿。
Zhēnshì nányǐ-zhìxìn，gēnjù tāmen de guānfāng shùjù，cóng qùnián niánchū dào jīnnián niánchū ，dǒuyīn guónèi de rìhuó cóng sānqiānwàn zēngzhǎng dào èrdiǎnwǔyì。
It’s just incredible. According to their official statistics, Douyin’s number of daily active users (DAU) grew from 30 million to 250 million from early 2018 to early 2019.