Yii Framework is an open-source, high-performance PHP web application framework that provides a solid foundation for developing modern web applications. It uses the Model-View-Controller (MVC) architectural pattern and provides various features like authentication, authorization, caching, and database abstraction out of the box.
Express.js is a robust Node.js web application framework that provides a simple yet powerful API for building web and mobile applications. It offers various features and middleware that make it easy to handle HTTP requests, routing, and middleware functions.