Should I add a site Map to my website?

Hello,

As per my knowledge both HTML and XML sitemaps are very much important. XML sitemap is a way to tell Google about pages on your site. Creating and submitting the XML Sitemap to Google webmasters Tool helps you to make sure that Google knows about all the pages on your site, including URLs that may not be discoverable by Google's normal crawling process. XML sitemap will be helpful to index your web pages comparatively faster and HTML sitemap is helpful to your website visitor regarding proper navigation. So both XML and HTML sitemaps are important.