A Sitemap is a file with information about website pages that are available for indexing. By putting this file on your site, you can tell Yandex:
The Sitemap file is taken into account when the robot indexes the site. However, Yandex doesn't guarantee that all URLs specified in the file will be added to the Yandex search index.
The Yandex robot usually finds out about the site pages as it follows links from page to page. In most cases, this is enough for fully indexing sites. However, the robot might miss certain pages or misunderstand their importance. The most problematic pages are usually dynamic pages or pages that can only be reached by following a long chain of links. The Sitemap file helps avoid these problems.
There are many resources available in the internet for creating a Sitemap file automatically. The file must conform to one of the formats described below. Place the file in the site's root directory (http://<site address>/sitemap.xml).
You can find answers to many questions about creating a Sitemap on the official site.
Yandex supports two Sitemap formats:
We recommend using XML format, because it allows you to provide additional information about site pages. For each URL, you can specify:
The date of the last page update (the lastmod element).
How often the page changes (the changefreq element).
The relative importance of the page (the priority element).
Yandex search doesn't support transmitting information about images or RSS/Atom feeds using the Sitemap file. To transmit information about videos, use links to XML feeds in the Sitemap file (for more information, see the Help for the Yandex.Video service).
The file must conform to these general guidelines:
You can use the following ways to tell Yandex that your site has a Sitemap file:
Enter the file's URL in the Yandex.Webmaster service.
Add a sitemap directive to the robots.txt file on the site.
There is no restriction on the number of files that you can specify for the same domain.
To make Yandex stop using the data from the Sitemap file when indexing the site, select the site in Sitemap files in the Yandex.Webmaster menu, and remove the file's URL from the list.
If the file was also specified in the sitemap directive in the robots.txt file, you need to delete this directive.