Yeap, sitemap updates automatically, unless if you have created that sitemap manually yourself.
Otherwise, all new posts, etc, updates, indexing priority, are all handled by the sitemap plugin itself (assuming if it's WP), and once you upload that sitemap link to big G, it will keep track of those automatically thereafter, leaving more time for you to do other things.
No, you don't need to resubmit your sitemap for your new post getting scrolled. Sitemap automatically updated on the daily or weekly basis as you set the time duration. Here I am sharing some information about the sitemap which will help you to understand it very well.
First I would like to explain what is sitemap?
A site map is a model of a website's content designed to help both users and search engines navigate the site. A sitemap can be a hierarchical list of pages (with links) organized by topic, an organization chart, or an XML document that provides instructions to search engine crawl bots.
There is one more question comes to the mind that Does your business needed sitemap?
Yes, even you are site crawled time to time, you need the sitemap to improve your site's crawl status.
If the file name is the same then you don't have to resubmit it.
And although the sitemap update function is automatic within wordpress, it isn't the case with all CMS.
On many shopping CMS for example, it's often not automatic without setting up cron jobs.
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