It is very compulsory for a website to have a sitemap. But most of the website today also are not aware of the benefits of sitemap and they remain low. If you have website of more than 100 or 1000 pages then you should make sitemap so that spiders can reach the bottom of your each page.
If you don’t know how to make sitemap then search about it on google and there are various tools available where you can make your sitemap i.e xml sitemap where you can make sitemap and submit the same in google analytics.
