Sitemap files are a great way to make your content known to Google and to other search engines. To handle large websites, you can generate more than one sitemap file per website. You can either submit these individually, for example, through a Google Search Console, or you can create a sitemap index file.
A sitemap index file is like files for sitemaps. You can list multiple sitemap files in it. Using a sitemap index file, you can submit multiple sitemap files for your website in Google Search Console, even if you have fewer than 50,000 URLs. By doing that, it will be easier to keep track of different sections of your website, and maintain your sitemap files. When it comes to creating sitemap files, i strongly recommend that you have these made automatically through your server directly. That’s the best way to make sure that your new and updated content is highlighted to search engines as quickly as possible.