CodeIgniter is a PHP web application framework that is commonly used for web development projects. It provides a range of features and tools that simplify the development process, such as a Model-View-Controller (MVC) architecture, routing, database abstraction, and form validation.

When using CodeIgniter for web development, developers typically follow a structured process that includes planning, design, development, testing, and deployment. During the planning phase, the developer works with the client to define the project requirements, identify the target audience, and determine the project timeline and budget.

Once the planning phase is complete, the developer begins designing the website, typically using wireframes and mockups to create a visual representation of the website's layout and structure. Once the design is approved, the developer moves on to development, where they write the code that brings the website to life.

During the development phase, the developer uses CodeIgniter's features and tools to build the website's functionality, such as user authentication, database integration, and payment processing. Once the development phase is complete, the website undergoes testing to ensure that it is free of bugs and errors.

Finally, the website is deployed to a live server, where it becomes publicly available to users. Ongoing maintenance and updates are typically required to ensure the website remains secure and up-to-date.

Overall, CodeIgniter is a powerful and flexible PHP framework that is well-suited for web development projects of various sizes and complexities. Its ease of use, speed, and focus on security make it a popular choice among developers.