This document provides an introduction and overview of Appium, an open source tool for automating mobile applications. It discusses that Appium allows testing of native, hybrid, and mobile web applications on iOS and Android platforms. It also outlines the key benefits of Appium, including that it is open source, cross-platform, supports various frameworks, and has an active community. The document then describes Appium's architecture, how it works with Android and iOS, and system requirements for setting up Appium tests. Finally, it provides basic steps for getting started with Appium testing and some cons to using Appium.