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Yii is a BSD-licensed open-source PHP framework that includes the essential characteristics required to construct quick, scalable, and feature-rich Web-2.0 applications.

MVC, DAO/ActiveRecord, I18N/L10N, APC (Advanced PHP caching), database migrations, authentication and role-based access control, scaffolding, testing, and so on.

Yii is a framework greatly inspired by Ruby on Rails. Yii, like other php-frameworks such as CakePHP, prefers standards over configuration.

Yii favors passive loading but may conduct eager loading if necessary. The mixin pattern in Yii's behavior system allows for multiple inheritances. The framework as a whole is very extensible. User-contributed extensions are available from both the official extensions and the unofficial extensions.