Search engine submission
Search engine submission is how a webmaster submits a website directly to a search engine. While Search Engine Submission is often seen as a way to promote a web site, it generally is not necessary because the major search engines like Google, Yahoo, and Bing use crawlers, bots, and spiders that eventually would find most web sites on the Internet all by themselves.
There are two basic reasons to submit a web site or web page to a search engine. The first reason would be to add an entirely new web site because the site operators would rather not wait for a search engine to discover them. The second reason is to have a web page or web site updated in the respective search engine.
How web sites are submitted There are two basic methods still in use today that would allow a webmaster to submit their site to a search engine. They can either submit just one web page at a time, or they can submit their entire site at one time with a sitemap. However, all that a webmaster really needs to do is to submit just the home page of a web site. With just the home page, most search engines are able to crawl a site, provided that it is well designed.
Most websites want to be listed in popular search engines, because that's how most people start their search for a product or service. A searcher, (or AKA "User"), seek information on the web, using a search engine. Websites that appear on the first page of a search are, usually, called the top 10. Clicking on the blue URL / hyperlink causes the web page / website to appear in the web browser.
Thus, webmasters often highly desire that their sites appear in the top 10 in a search engine search. This is because searchers are not very likely to look over more than one page of search results, known as a SERPs.
In order to obtain good placement on search results in the various engines, webmasters must optimize their web pages. The process is called search engine optimization. Many variables come into play, such as the placement and density of desirable keywords, the hierarchy structure of web pages employed in a web site (i.e., How many clicks from the home page are required to access a particular web page?), and the number of web pages that link to a given web page. The Google search engine also uses a concept called page rank.
PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at considerably more than the sheer volume of votes, or links a page receives; for example, it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important." Using these and other factors, Google provides its views on pages' relative importance.
XML sitemaps 
Google Sitemaps was introduced in June 2005 so web developers could publish lists of links from across their sites. The sitemap is used to make the search engine aware of the site and the pages on the site.
Search engine submission services 
By 2004, the major search engines, "the big four", Google, Yahoo!, Microsoft Live and Ask.com, already had the ability to automatically discover new webpages by crawling links from other sites.
The exception to this rule occurs when a new site under a new domain name wishes to be indexed. As inbound links have not yet been established, search engines have no way to automatically discover the new site. In this case using search engine submission is necessary.
Search Engine Submission Software is very useful for Global Internet Marketing 
Many once-small search engines in China and India are getting more and more popular after 2007. For example: Baidu.com(Nasdaq:BIDU) was not well known at the beginning. It is now the most popular search engine in China, while Google is in second place. Without submitting to these search engines via search engine submission software, you may miss millions of visitors who might come to your website via these search engines. The second benefit is that, some search engine submission software not only submit your web site to search engines, but also add links to your web site from their own link pages submitted. This is very helpful in increasing your web site's ranking, because external links are one of the most important factors to a web site's ranking.