This is one of the files that robots are checking when they visit your website. You may block some robots, or tell them what URL then cannot see/index, or where is the sitemap.
Of course, robots may ignore this file, and you should not give critical information (for instance, you are forbidding access to
/download/, but you are also telling hackers that you have a folder
# allows everyone User-agent: * Disallow: # link to the sitemap (optional) Sitemap: https://memorize.be/sitemap.xml