Sitemaps, as the name implies, are just a map of your site - i.e. on one single page you show the structure of your site, its sections, the links between them, etc. Sitemaps make navigating your site easier and having an updated sitemap on your site is good both for your users and for search engines. Sitemaps are an important way of communication with search engines.

Sitemap tells user and search engines where the specific topic lies on a website. Sitemap is important for users and search engines because it tells spiders to search the changed content faster than when you do not have sitemap. Sitemaps are an important way of communication with search engines and we tell search engines where to go. Sitemap helps to list all URLs of your website. It permits webmaster to add extra information about each and every URL.here is no downside of having an XML Sitemap and having one can improve your SEO, so we highly recommend them.

You can submit sitemap of your website to bing webmasters tool, it will help the bing crawlers to index your site and then bing will deliver the traffic to your website. also try to use alt attribute for each image as bing gives preference to the image optimization

It basically provides a map for the crawlers to visit the site

A sitemap tells Google which pages and files you think are important in your site, and also provides valuable information about these files. For example, when the page was last updated and any alternate language versions of the page.