Unfortunately, billions of web pages are indexed, and millions of web pages are being added every day. It is not sufficient to be included in any search engine index, but also important that potential customer (or information seekers) visit your website. When searching for any product or service, usually, people go no deeper than 3-4 pages. If your web page is embedded deep in the search results, it is unlikely that anyone visits your web page. Therefore, you need to improve the visibility of your web site (or web pages contained in your web site). The answer to this is: Search Engine Optimization.