Search engines presented Search engines Sitemaps so web designers can post details of hyperlinks from across their websites. The basic assumption is that some websites have a huge number of powerful webpages that are only available through the use of types and user records. The Sitemap information contains URLs to these webpages so that web spiders can find them.

yes it is, it refers all your website link map and its better for search engines to crawl your website.

A website map (or sitemap) is a record of webpages of a website available to spiders or customers. It can be either a papers in any type used as a preparing device for Web style,

Sitemap is very important for Website, there are two type Sitemap, one is XML sitemap which is helpful for crawling your site url by search engine,and the other is html which is helpful for visitor to get all url of the website at one page.

sitemap.xml is very useful for the point of view of SEO.

Google introduced Google Sitemaps so web developers can publish lists of links from across their sites. The basic premise is that some sites have a large number of dynamic pages that are only available through the use of forms and user entries. The Sitemap files contains URLs to these pages so that web crawlers can find them.

site map is important
 

Sitemap is a list of pages encapsulated at one place. it is generally used for fast indexing of our web pages in search engine database.
There are two major site maps. One is xml and second is html.
xml is used for search engine or html is used for users.

you can subit all post to google using it

Importance of Sitemap ?
 

There are numerous search engine optimization tips and tricks that help in optimizing a site but one of them, the importance of which is often overlooked is sitemaps. Sitemaps, as the name implies, are simply a map of your web site

On a single web page you display the structure of your site, its sections, the hyperlinks between them, etc. Sitemaps make navigating your site simpler and having an updated sitemap on your site is beneficial both for your users and for search engines like google. Sitemaps are an important way of communication with search engines. In your robots.txt you tell search engines which parts of your web site to exclude from indexing, in your sitemap you tell the search engines exactly where you'd like them to go.

Sitemaps are not a novel idea. They have always been a part of best web design practices but with the usage of sitemaps by search engines, now they have become a lot more important. However, it's important to make a clarification that if you are looking at sitemaps primarily from a SEO point of view, you cannot use the traditional sitemap only (although currently Yahoo! and MSN still adhere to the standard html format). For instance, Google Sitemaps uses a special XML format that's totally different from the ordinary html sitemap for human visitors.

One might ask why two sitemaps are necessary. The answer's clear - one is for humans, the other is for bots (for now mainly Googlebot but it's reasonable to anticipate that other crawlers will join the club soon). In that relation it's important to clarify that having two sitemaps is not regarded as duplicate content. In 'Introduction to Sitemaps', Google explicitly states that using a sitemap will never lead to penalties for your web site.

Google crawls your website using your sitemap..so its most important for a site..Seach on Google..you will get best of best sites to generate a sitemap..

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sitemap defines your all pages in one page.

In order to make google robot read our website data ofcourse sitemap is must.

Various Sitemaps are present but XML is important for search engines.