Sitemap Ц this site map in XML. File "Sitemap" is intended to inform search engines (such as Yandex, Google, Yahoo, MSN and others) on the site, which should be indexed. Sitemap significantly speeds up the scanning site. In addition, Sitemap allows you to pass information on all pages of your site, including those that search engines can not be obtained during normal scanning.
Creating a Sitemap is especially useful when:
In accordance with the Sitemap Protocol and the requirements of search engines Sitemap file should contain no more than 50 000 pages and not exceed the size of 10 MB. This means that if your site contains more than 50,000 pages and file size Sitemap than 10 MB, you must create multiple Sitemap.
ƒFor each page of the protocol Sitemap, except compulsory parameter URL, provides additional tags:
Lastmod Ц indicates the date of last modification date.
Changefreq Ц the probable frequency of the page content. Valid values are:
Priority Ц the priority of the page relative to other pages on your site. The valid range - from 0,0 to 1,0. This tag lets the search engines know which pages you think are most valuable.