301 Redirect How to move your web servers files without harming SEO

If you must restructuring your website, be sure to do it with cautions.

Simply because you might be negatively affecting your present SEO score (page rank, backlink,etc). Utilize 301 redirect approach to restructure your internet site without harming your current SEO score.

Source:
http://realworldbusiness.com/seo/301-redirect-how-to-move-your-web-servers-files-without-hurting-seo/