CodeIgniter is an open source and effective PHP framework with a very tiny footprint. CodeIgniter contains libraries, simple interface and logical structure to access the libraries, plug-ins, helpers and some other resources which solve the complex functions of PHP more easily maintaining a high performance. It simplifies the PHP code and brings out a fully interactive, dynamic website at a much shorter time. It supports PHP version of 5.2.6 or newer and MySQL version 4.1 or newer. It makes your web more robust and your code easier to read and maintain. It is a free toolkit, lightweight and easier to install.