Hi there, just want to know is google site map is usefull for search engine optimization. I have heard something about this but not sure how to use this or how usefull is it. thanks
yes it is useful want to know more about it read this http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=40318
i think it is really effective... since when I start to use it, i always get ranked now on google search engine in some keywords.
you have to place a Sitemap-formatted file on the Web server which enables Google crawlers to find out what pages are present and which have recently changed in order to crawl site accordingly.
Ya its a helpful one to have Search engine specific sitemap like Google. Being the leader in search engines. It might boost ur search engine rank as well.
A sitemap does NOT effect your rankings at all, and they are not needed. If you actually "need" a sitemap then you have issues with your site structure and a sitemap is the least of your worries.
other reason why its a big help, it simply because you (your site) helping the spider to easily crawl your pages which turns to quick indexing.