the site I am not working on has a sitemap and it is being used by google. But I am wondering if that is because it was submitted via webmaster tools rather than google finding it. There is no mention of the sitemap in the robots.txt file which is why I am wondering if this is the case. Or does google do a check for sitemap.xml anyway?
I’m assuming it would be beneficial to add the sitemap location to robots.txt to ensure other search engines will be able to find it.