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Benefits to using a xml sitemap. The first set of benefits revolve around being able to pass extra information to the search engines. Your sitemap can list all URLs from your site. This could include pages that aren't otherwise discoverable by the search engines.
XML sitemap for your website helps search engines to know more about your website structure. Submitting your XML sitemap to Google webmaster account helps to index your webpages faster in search engines.
XML Sitemaps are important for SEO because they make it easier for Google to find your site's pages—this is important because Google ranks web PAGES not just websites. There is no downside of having an XML Sitemap and having one can improve your SEO, so google highly recommend them.
In default the Google gets to crawl all your links in your website, especially even the server links. Maybe you try and learn, if you just update your site to Google webmaster without sitemap.xml, even your sites server path will be shown as a link in SERP. Especially Apache root address which can make your site vulnerable to hackers.
So understand sitemap.xml is like, guiding your Google Crawler to crawl only certain links. You can generate sitemap for free. Search for Generate free site map, a site map will be generated. Then open the site map, in that adjust values, for which links the crawler should give importance. Like the index page and blog page, the value will be from 0.10 to 1.00 given under each link generated in sitemap.xml. Check that if sitemap.xml contains every links inside your site, if not add it. Once you're done with the site map, upload it to the your server database and then upload it to Google webmaster.