Deep links allows you to deep-link users from various different sources directly into your app. Deeplinks also allow you to send your users to some other app directly, with the click of a button. Deep-linking also acts as the base for app-indexing, which allows content in your app to be directly searchable via google.

Deep Link Tester allows you to simply test and verify deep links on your android phone itself. Using this, there is no need for ADB at all to test deep links.