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.
Sometimes getting ranked on Google feels like rocket science, especially since how Google decides to list your site is based on algorithms that frequently change. This requires you keeping up on current rules and trends. For example, in 2015 Google decided it would give preferential ranking to sites that were mobile-friendly since so many people are now using mobile devices. Even more recently, Google added a notice in the Chrome browser to indicate if a site was secure with SSL or not (FireFox has this feature as well) and includes it as part of it's ranking formula.
A content marketer, for example, can create a series of blog posts that serve to generate leads from a new ebook the business recently created. The company's social media marketer might then help promote these blog posts through paid and organic posts on the business's social media accounts. Perhaps the email marketer creates an email campaign to send those who download the ebook more information on the company. We'll talk more about these specific digital marketers in a minute.