struts is a open source implementation of MVC design pattern to develop large scale web applications.Struts framework makes it easier to design realible,scalable web applications in java.Struts is not only thread safe but also thread dependent.It instantiates each action once and allows others to  be threaded through the original object.Struts reduces the for redundant jsp's.ActionForm stratagy reduces the need of sub class hierarchy.

Struts is a light weight package.It consists of 5 core packages and 5 tag lig directories.