Adobe Flex is a cross-platform development framework, designed for generating Rich Internet Applications. It facilitates in the development of high performance applications that can run easily on all key operating systems and browsers. The Flex framework is a compilation of various technologies released by Adobe Systems and it can be used to deploy applications based on proprietary Adobe Flash platform. Flex applications are the presentation layer in multi-tiered architectures.

One of the best features of a Flex application is that it does not require a page refresh for every change. User-friendly in nature and designed to offer a complete new web experience; Adobe Flex is available in different version like Adobe Flex 2, Adobe Flex 3. These days it is widely used by many firms to offer business-to-business applications, interactive data dashboards and online product selectors. It also helps in delivering solutions that improve user productivity and increase online revenues, while integrating with already accessible applications and websites. The Flex development model makes the best use of XML for an easy and effective implementation of ECMAScript.