Apache Tiles is a templating framework built to simplify the
development of web application user interfaces. Tiles allows
authors to define page fragments which can be assembled into
a complete page at runtime. These fragments, or tiles, can
be used as simple includes in order to reduce the duplication
of common page elements or embedded within other tiles to
develop a series of reusable templates. These templates
streamline the development of a consistent look and feel
across an entire application. Tiles grew in popularity as a
component of the popular Struts framework. It has since been
extracted from Struts and is now integrated with various
frameworks, such as Struts 2 and Shale.