A sitemap is a file where you can list the web pages of your site to tell Google and other search engines about the organization of your site content. Search engine web crawlers like Googlebot read this file to more intelligently crawl your site.
A static sitemap is not changed until the webmaster updates it. I think the reasons why in theory, someone might think a dynamic sitemap would be helpful in getting new pages crawled sooner, but in practice I would not expect it to matter very much at all..
Submit your static pages to Google so that search robots could index and display them in SERPs.
Just follow these easy steps:
First go To Google Search Console known as Google webmaster tools
Then Choose your blog from the list provided
Now click Crawl > Sitemaps at the left sidebar menu
Click on ADD/TEST SITEMAP button towards yours top-right side
Now Insert sitemap-pages.xml inside the text field.
Finally press “Submit” button and you are all done then refresh and wait!
Same method applies for all other search engines like Bing/Yahoo and Yandex.