Web Application Testing is done on a website to check its load, performance, Security, Functionality, Interface, compatibility and other usability related issues.

In Web application testing, three phases of testing is done, they are,

Web Tier Testing
In Web tier testing, the browser compatibility of the application will be tested for IE, FireFox and other web browsers.

Middle Tier Testing
In Middle tier testing, the functionality and security issues were tested.

Database Tier Testing
In Database tier testing, the database integrity and the contents of the database were tested and verified.