Why we need a sitemap in website

Hi...
Can you tell me Why we need a sitemap in website.???
Thanx in advance..

We add sitemap.html for visitors and we add sitemap.xml for Google webmaster tools.

sitemap can help your visitor to visit your site easily,
Google also support a site having sitemap.

Sitemap as name suggests it’s a map of a website which contains all website pages link on a one page so that users and search engine bots can easily find all web services and other pages of the website from one page. There are two types of Sitemaps one is HTML and the second is the XML sitemap in which HTML sitemap is used for users and XML sitemap is used for search engine bots. You can also submit your XML sitemap in different search engine webmaster tool so that your website pages can be easily indexed by search engines.

Site maps are essential for seo purpose but more importantly it helps the visitor to navigate your site.
Types of site map.
1) html site-map 2) xml sitemap

xml sitemap - Moreover it does increase the ranking of the site but it makes the indexing faster. It is very useful for the sites that are updated frequently. If you include the xml sitemap the robots will crawl easily.

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sitemap can help your guest to check out your website quickly,
Google also assistance a website having sitemap.

sitemap can help your guest to check out your website quickly,
Google also assistance a website having sitemap.

this is important information for webmaster this post very helpful for webmaster.

sitemap is used for crawling purpose... it make crawling easier and indexing of website faster.