A source is a single app or Amazon product on a single store, or a single CSV import. All countries are included for each source.
For example, if you want to track an app on iOS and Google Play that would count as 2 sources – one source for each app store. For example, your iOS app would count as one Source, and your Google Play app would count as a second Source.
Each Appbot plan allows you to track a different number of Sources in total.