Web Application Development involves creating software applications that run on web browsers, either on desktop computers or mobile devices. Web applications are typically designed to offer users a more interactive and responsive experience than traditional static websites, allowing them to perform more complex tasks and interact with data in real-time.

Web application development involves several key stages:

1. Planning and Requirements Gathering: The initial phase where the web application's objectives, target audience, and functional requirements are defined.
2. Architecture and Design: Developing the system architecture and creating the wireframes and design for the application.
3. Development: Coding the application using various programming languages and frameworks.
4. Testing and Quality Assurance: Performing unit testing, integration testing, and other forms of testing to ensure the application is functioning as intended.
5. Deployment and Launch: Deploying the application to a web server and making it available to end-users.
6. Maintenance and Support: Providing ongoing maintenance, updates, and technical support to ensure the application continues to function smoothly.

Web application development can involve front-end development, back-end development, or a combination of both. Front-end development focuses on the user interface, including the design and functionality of the user-facing components of the application, while back-end development involves building the server-side infrastructure that powers the application, including databases, APIs, and server software. Web application development also requires knowledge of web development technologies such as HTML, CSS, and JavaScript, as well as popular programming languages such as PHP, Python, Ruby, and Java. Popular web application frameworks include Angular, React, Ruby on Rails, Laravel, and Flask. The key to successful web application development is creating an intuitive and responsive user interface that can handle complex tasks and deliver real-time data updates to users.