Sitemap.xml is a special file that contains

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all the links to the website pages that should be indexed in search engines (SE), such as Yandex or Google. In our article, we will explain in simple terms why the sitemap.xml file is needed, what requirements are imposed on it, and also show several free sitemap generators.
Why do you need a sitemap.xml
The sitemap.xml file is a kind of site map that shows search robots which pages of a web resource should be included in the search engine index. It is recommended to create a sitemap.xml in order to:

quickly index specific pages of the site;
notify search engines about a web resource update;
show the resource update frequency;
determine the importance of pages among the entire web resource.
Sitemap.xml is a sitemap.
File requirements
File requirements from Yandex PS:

The recommended file format is XML.
A mandatory element in the file is loc (page address).
Optional elements: lastmod (date of the last page update), changefreq indonesia whatsapp number database (frequency of changes), priority (importance of the web page).
The value of the priority element is in the range from zero to one, where 0 is the lowest priority and 1 is the highest. The Yandex robot loads web pages in the order of the queue, taking into account the presence and value of this coefficient.
UTF-8 encoding must be used.
The limit on the number of links in one file is 50 thousand.
The uncompressed file size limit is 50 MB.
Links in the sitemap should only lead to the domain name where the file is located.
The file must be accessible to the search engine - the server must return HTTP code 200.
File requirements from Google PS:

Additional information about different types of content can be added to the file, for example, for video files and images. For videos: video length, category, age limit. For images: depicted object, type, licensing terms.
Specify full URLs using the same syntax.
Do not include session IDs in the URLs you add.
Using the hreflang attribute, you can specify versions of the site in another language.
File encoding is UTF-8.
Requirements for the total number of pages and file size are similar to Yandex. It is recommended to split very large sitemap files into parts.
The file must contain only canonical page addresses.
An example of what part of our project's sitemap looks like.