Following are some points taken into consideration in Appium Design :
* Node.js should be installed already on the system as Appium Server is actually a HTTP server designed using Node.js that drives iOS and Android sessions with help of WebDriver JSON wire protocol.
* Appium server installed on system acts as REST API.
* Appium server receives connection and command requests whereas command executes on iOS/Android devices.
* Appium server sends HTTP responses to interact with the user interface using the mobile test automation framework.
* There are various frameworks for
* iOS mobile devices
* Google UI Automator for Android API level 16 or higher
* Selendroid for Android API level 15 or higher
