Is It Necessary to update sitemap?

You should always keep your sitemap updated with the current pages of your website. This is best achieved with a CMS sitemap plugin if your website uses a content management system. If your website is custom and does not use a content management system, you will need to use a standalone sitemap generator that can regularly update your sitemap when new pages are published or old pages are deleted.
 
It depends on how often content on your site changes. If you're adding hundreds or thousands of new pages every day, making lots of redirects each week, etc. you might want to be as fast as weekly or even nightly or for sites with fewer changes than this, monthly is OK. But for daily updated sites it should be once in a week or you can maunally crawl that link in google analytics.
 
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