The goal of SEO is to get a web page high search engine ranking. The better a web page's search engine optimization, the higher a ranking it will achieve in search result listings. (Note that SEO is not the only factor that determines search engine page ranks.) This is especially critical because most people who use search engines only look at the first page or two of the search results, so for a page to get high traffic from a search engine, it has to be listed on those first two pages, and the higher the rank, the closer a page is to the number one listing, the better. And whatever your web page's rank is, you want your website to be listed before your competitor's websites if your business is selling products or services over the internet.
A backlink is a link to your website from another website. Backlinks from complementary businesses or industry influencers will not only get your business in front of a larger audience, but it will also drive qualified traffic to your website. In addition, Google picks up on backlinks and will increase its trust in your business if it sees other trusted sites pointing to yours. More trust from Google leads to higher rankings, which leads to more traffic. Get noticed on Google for free with quality backlinks.
The leading search engines, such as Google, Bing and Yahoo!, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. The Yahoo! Directory and DMOZ, two major directories which closed in 2014 and 2017 respectively, both required manual submission and human editorial review. Google offers Google Search Console, for which an XML Sitemap feed can be created and submitted for free to ensure that all pages are found, especially pages that are not discoverable by automatically following links in addition to their URL submission console. Yahoo! formerly operated a paid submission service that guaranteed crawling for a cost per click; however, this practice was discontinued in 2009.