1. Improvement of UsabilityThis refers to the process of making it easier for users to choose from countless apps on the App Store. The ranking system aids this process by enabling users to easily find popular and highly rated apps.2. Enhancement of App Visibility and ExposureThis refers to the fact that high-ranking apps often appear in prominent positions in the App Store's search results and featured sections. This increased visibility leads to more users seeing these apps and potentially downloading them.3. Measurement of Marketing and Promotion EffectsThis refers to the use of app rankings as a metric to measure the effectiveness of marketing campaigns and promotions. If the ranking rises, it can be inferred that the campaign is likely successful.4. Building User TrustThis refers to the idea that a high ranking serves as a testament to user trust. The fact that many users are downloading the app sends a strong signal that the app is valuable.5. Increase in RevenueThis refers to the tendency for high-ranking apps to have more downloads, which directly leads to increased revenue. This is particularly important for apps that generate revenue through in-app purchases or advertising, as expanding the user base is crucial.