To use ADB with your Android device, you must enable a feature called "USB Debugging." Open your phone's app drawer, tap the Settings icon, and select "About Phone." Scroll all the way down and tap ...

Google has shed more light on how Android's app verification rules will work, which will block sideloading apps from unverified developers.

Google is addressing doubts regarding the upcoming developer verification for Android app sideloading. More details here.