Yii is an acronym for “Yes it is”. It is an elemental, open-source PHP 5 based high performance framework, used for creating web 2.0 apps. Yii is loaded with many rich features like MVC, I18N/L10N, DAO/ Active Record, caching, scaffolding, authentication, testing, role-based access control, etc. This framework has a supplemented stock room including of user-contributed units. This is a very efficient platform for developing app in minimal time. Providing a hige range of niche functionalities to the developers, Yii has assisted developers to build some great PHP frameworks. Yii receive huge adoration and acknowledgement in the world of web app development due to its robust features. These functionalities assisted in decreasing the efforts at the developer’s end. This high-performance component-based PHP framework has overruled the market because of its supremacy in delivering time saving and cost effective web apps.