Kohana is a PHP 5 framework that uses the Model View Controller architectural pattern. It aims to be secure, lightweight, and easy to use. Although it reuses many common design patterns and concepts, there are some things that make Kohana stand out. It is community driven, uses strict PHP 5 OOP to provide visibility protection, automatic class loading, overloading, interfaces, abstracts, and singletons, and is extremely lightweight. Kohana has no dependencies on PECL extensions or PEAR libraries. Large, monolithic libraries are avoided in favor of optimized solutions.