Once you publish new content, search engines may not index them right away. It may take some time unless you have blocked search engines from crawling your pages. Search engines crawl and update their search index with latest updates of sites periodically. But what if you wanna let know search engines about your site or content changes and let them indexed more quickly?
Submission of URL
Here I'm gonna list popular search engines which allows submitting URLs manually.
Submission of XML Sitemap
Submitting XML sitemap help search engines to find what are the pages available on your site and crawl all of pages without missing any of them. Submission of an XML sitemap can guarantee that your pages are queued to be indexed in search index of search engines. So it is far more effective than submission of URLs, we discussed above.