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A sitemap is a file that contains a list of all the pages on your website. It helps search engines index your website so that people can find it more easily.
Please note that it doesn't guarantee that all the items in your sitemap will be crawled and indexed. More information on Google Search Console
Usually the sitemap is named as sitemap.xml and is placed at the root of your website.
However it doesn't matter if you name it differently. What's important is that you should tell search engines about your sitemap location. More Info on Google Search Console
No, it is not required to always have a sitemap. Search Engine can still index a website even if doesn't have a sitemap.
However, a sitemap can be helpful if you have a large website as a result Web Crawlers might overlook crawling some of your pages.
In that case having a sitemap makes the job of search engines crawlers easier.
You don't need to mention all the URLs of your website in the sitemap.You can just include the most important pages that you want to indexed by search engines.
You can find sitemap of other websites by using our free
robots.txt file helps search engines understand which parts of your website they should index and which parts they should ignore.
For eg. If you have an /admin route on your website and you don't want search engines to index that route, you can add the following line to your robots.txt file:
User-agent: * Disallow: /adminand search engine crawlers will ignore this route.
Yes, you should mention your sitemaps in robots.txt file. This will help search engines find your sitemap and index your website more easily.