Appium architecture

Client: Client in Appium terminology is one of the client libraries (in Java, Ruby, Python, PHP, JavaScript, and C#) available for Appium. These libraries provides mobile specific commands (such as multi-touch) in addition to standard Selenium commands.

Server: If you have ever used Selenium RC before, you’ll find that Appium works in a similar line. Just like Selenium server in Selenium RC, Appium essentially is a server at its very core. It facilitates communication between client and a mobile device. It is important to note here that Appium server is written in Node.js. That’s why we need Node.js installed in our system to use it.

Appium architecture