"App Unit" is a specific term on App Store Connect (Apple's app management platform), referring to the number of times a specific app is installed on a specific device for the first time. On the other hand, "App Install" refers to the overall process of an app being downloaded and installed on a device by a user. These two terms are explained in comparison.App UnitDefinition: An App Unit is a metric that measures the number of times a specific app is downloaded to a specific device for the first time. It does not count re-downloads or downloads to different devices using the same ID.Purpose: App Units are used to measure the acquisition of new users. This allows developers and marketers to evaluate the effectiveness of marketing campaigns and strategies to attract new users.App InstallDefinition: An App Install refers to the process of an app being downloaded and installed on a device by a user. This includes not only initial installs, but also re-installs and updates.Purpose: By tracking the number of app installs, you can understand the popularity and usage of the app, and evaluate the performance of the app.ComparisonCommonality: Both are metrics for measuring app downloads and usage.Difference: While App Unit only counts initial installs and measures the effectiveness of acquiring new users, App Install counts all install events (initial, re-install, update).In other words, App Unit is a metric for measuring the acquisition of new users, while App Install is a metric for understanding the overall number of app downloads.