What are the models that are used in web application development?

In web application development, several models are commonly used, including the Model-View-Controller (MVC), Model-View-ViewModel (MVVM), and the Client-Server architecture. MVC separates the application into three interconnected components: the model (data), the view (user interface), and the controller (business logic). MVVM, often used with frameworks like Angular and Vue.js, enhances the separation of concerns by introducing a ViewModel that manages the data binding between the model and the view. The Client-Server model divides the application into two parts, where the client requests resources from the server, which processes the requests and returns the appropriate responses.