Web application development is the process of creating a web application. A web application is an application that is accessed over a network, such as the Internet, and is usually based on a client-server architecture.

The process of web application development can be divided into three parts:

1. The first part is the client-side development, which is responsible for the look and feel of the application. This includes the design of the user interface, the layout of the pages, and the interactions between the user and the application.

2. The second part is the server-side development, which is responsible for the functionality of the application. This includes the implementation of the business logic, the database access, and the web services.

3. The third part is the testing and deployment of the application. This includes the set up of the test environment, the creation of the test cases, and the deployment of the application on the web server.