This document discusses Appium, an open source test automation framework for use with native and hybrid mobile apps. It can be used to write automated tests for iOS, Android, and Windows apps using the Selenium WebDriver API. Appium allows tests to interact with apps as if a real user was using the app by finding and interacting with UI elements. Examples are provided showing how to find elements, enter text, click buttons, and assert values using Appium. The document also notes that Appium can run tests remotely on a grid for parallel testing across devices.