CodeIgniter is a globally popular, open-source PHP framework, used for developing scalable websites and web apps. It allows CI developers to build fast, dynamic, and robust solutions for a multiple number of industries. Being based on MVC structure, it helps CI experts to create smart and engaging CI solutions. Due to its simplicity and easy to use traits, CI is quite popular among the PHP developers. CI uses a very simple logical structure and reduces the need for writing the code from scratch. As compared to other PHP frameworks, CI has nearly zero configuration, which helps in speeding up the process of development.