PV（Page Views）：
The number of page views usually refers to the number of clicks per day. A user visits a page of the website once it is considered a PV. If a website has 1 million PVs every day, it means that all pages of this website are clicked 1 million times a day.
UV（Unique Visitors）：
The number of unique users (views) usually refers to the number of user views per day. The difference with PV is that if the same user clicks the page 10 times, it counts as 10 PVs, but only 1 UV. Some websites may use independent IP instead of this indicator without a user system.
DAU（Daily Activated Users）：
Daily active users, that is, the number of active users every day. Suppose a website has 1 million registered users, but generally not 1 million people log in every day, and there may be only 50,000 logins. Then these 50,000 are the number of active users. The definition of an active user may be different on different websites, but it is generally customary to say that a user who has logged in at least once a day is considered an active user.
MAU（Monthly Activated Users）：
Monthly active users, the number of monthly active users. The algorithm is similar to DAU, but the statistical period is one month.
LTV（Life-Time Value）：
User life cycle value. This indicator is used more in the game industry. It refers to how much money will be paid for the game in a user's "life cycle"-from the beginning of the game to the end of the game.
ARPU（Average Revenue per User）：
Average revenue per user. This indicator is not used to evaluate the income level of users, but from the perspective of Internet products to understand how much money can be earned from each user every year (a certain year). This indicator is used in many fields such as Internet products, telecom operation products, and game products. It is a very common indicator.