This document provides an overview of Appium, an open source test automation tool for mobile apps. It can automate native, hybrid and mobile web apps on Android and iOS. Appium uses the WebDriver protocol to allow tests to be written in any language. It wraps the vendor-provided frameworks like UIAutomation (Android) and Instruments (iOS) to expose them via the WebDriver API. The document discusses the types of mobile testing, challenges, Appium's philosophy, supported platforms and languages, architecture, requirements and provides references for further reading. It aims to introduce attendees to Appium and mobile automation.