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File .htaccess is the configuration file of Apache. It allows you to set the server response to user requests, configure caching and compression, as well as to differentiate access to various sections of this site.
File sitemap.xml is an xml file containing a complete site map. This file allows you to specify all pages of the site and some of their properties to improve the operation of search robots.
File robots.txt is the main file that describes the processing rules pages of the search engines. This file is needed to specify the primary site name, site map (sitemap.xml), public and private sections of the site.