Site maps can play a big part in improving your Search Engine Optimisation (SEO) ranking. They help ensure all pages and subsequently all SEO enriched content can be found.

Site-maps can act as a useful tool in ensuring that sites that have been built in flash and non-html languages are searchable

A site map is a list of all accessible pages on your site.  Commonly site maps are organised in a hierarchal manner – helping both visitors and search engine crawlers discover pages on your site.