Yii is a high-performance PHP framework which has powerful caching support and is explicitly designed to work efficiently with AJAX. Yii framework comes with numerous features such as MVC, integration with jQuery, scaffolding, skinning and theming, authentication, and role-based access control, caching, testing, etc. Being created with a simple learning curve, Yii promotes multiple virtues leading to the development of various types of projects specifically indirect customization, detailed documentation, generic caching solutions, and clean layouts that bring exceptional traffic to your website. it helps you develop clean and reusable code, ensuring a clear separation of logic and presentation. You can model database data in terms of objects and avoid the complexity and tedious nature of writing repetitive SQL statements.As Yii is designed to work well with third-party code, you can integrate other frameworks data into your Yii powered application.