Site maps are good for search engines and also for your customers. A good site
map has text links to all of the pages on your website which helps search
engines such as Google to move around your site and visit all of your pages much
more easily. The search engines use automated software called 'spiders' or
'bots' to visit and crawl throughout your site and to index the contents of
each page of your site.
From a visitor's perspective, a site map provides the
perfect 'fall-back' if they do not otherwise know where to look to find the
information that they seek.