Search engine submission is the process of submitting a website URL to search engines like Google, Bing, and Yahoo so that it can be indexed and show up in search results. This helps improve the visibility and accessibility of the website to potential visitors. Most search engines do not require website owners to manually submit their URLs, as they use web crawlers to discover and index new content on their own. However, manual submission can help expedite the process and ensure that the website is indexed in a timely manner.