This document discusses scaling Android tests using Selenoid. It notes that over 50% of internet traffic is from mobile, with about 75% from Android devices. Testing Android applications is complicated due to device variations. Using real devices is difficult due to low battery, connectivity issues, and limited lifetime. The document outlines how Selenium works with desktop browsers and how it can work with Android using the Android Debug Bridge, emulators, and frameworks like UI Automator and Appium. It proposes using Selenoid with Docker containers running Android images to provide scalable, isolated Android environments for testing. This approach allows tests to start in 5-10 seconds using memory snapshots and can scale to thousands of tests per day across multiple data centers.