Site maps are easy-to-understand diagrams showing the multiple levels of a web site. They clearly display connections and how they fit together.This makes them useful tools for communicating how processes work, and for clearly documenting the websites navigation. Additionally, the function of mapping a process out in a site map helps you simplify your understanding of that process and think about areas of improvement.
Site maps have the ability to easily navigate the website, build a step-by-step picture of the navigation for easier understanding, and define, standardize, and help look for enhancement in the website
The image below exemplifies Portfolio Survival Guide's site map.