Storyboards

What is the purpose of using a storyboard? It is good to have your thoughts and ideas down on paper this gives you a place to start when you a creating a website. You have a some guide lines to go by. such as what is the main topic and what will be on the pages.
How will they help you with your final project? If the story boards are complete before you start this will help with time if you are using a template you will just have to plug in the information and view it in a browser and see if you need to edit and make any changes.