中文：

用户覆盖率是衡量一个网站或者APP用户规模的重要指标，通常是指在一定时间段内，网站或者APP的独立用户数与目标受众总人数的比值。这个比值越大，说明网站或者APP的用户规模越大，影响力也越大。

用户覆盖率是通过统计不同设备的独立用户数量来计算的，包括电脑、手机和平板等设备。随着移动互联网的普及，移动设备的用户数量逐渐成为计算用户覆盖率的主要因素之一。

用户覆盖率的计算方式是：用户覆盖率=独立用户数/目标受众总人数。其中，独立用户数是指一定时间段内访问网站或者APP的不同设备的独立用户数量，目标受众总人数则是指网站或者APP所面向的目标受众的总人数。

在网站或者APP的运营过程中，用户覆盖率是非常重要的一个指标。如果一个网站或者APP的用户覆盖率较低，那么它的影响力就会受到限制，而且也难以实现商业价值的最大化。因此，提高网站或者APP的用户覆盖率是运营者需要关注的重要问题之一。

英文：

User coverage rate is an important metric to measure the size of a website or app's user base. It typically refers to the ratio of unique users of a website or app to the total number of targeted audience members within a certain time period. The greater this ratio is, the larger the user base and influence of the website or app are.

User coverage rate is calculated by counting the number of unique users of different devices, including computers, mobile phones, and tablets. With the popularity of mobile internet, the number of user of mobile devices has gradually become one of the main factors to calculate user coverage rate.

The calculation formula of user coverage rate is: user coverage rate=unique users/total targeted audience members. Among them, unique users refer to the number of different devices that visit the website or app within a certain time period, while total targeted audience members refer to the total number of targeted audience that the website or app aims to reach.

In the operation of a website or app, user coverage rate is a very important indicator. If the user coverage rate of a website or app is low, its influence will be limited, and it will also be difficult to maximize its commercial value. Therefore, increasing the user coverage rate of a website or app is one of the important issues that operators need to pay attention to.