Through which data source is volume provided?

We provide the keyword traffic for both the App Store and Google Play Store apps. For the App Store, we get the popularity scores for the countries where Apple Ads is available. For those countries, it's possible to see the historical changes in the traffic scores.  

 

                                 (Historical traffic changes for 'games' keyword)
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For the rest, we use Google's mobile search data and combine this with web search, search suggestion results and more to generate the most accurate traffic scores.