Deep Linking - Deep linking is the act of placing a hyperlink on a Web page that points to a specific page within another website, as opposed to linking direct to the main or home page.
Eg: If you link this article to any of your site web page, that would be considered as a deep link for this website.
Pushing and mixing in your deep links at the beginning of an page/article better assures that Google will accurately index these pages too. It’s not only a good idea to achieve a good PageRank on your home page, but it is also important to increase your back links to deep linked pages. You must anchor a relevant external deep linked page to your page, and secondly you must reference or link to other relevant pages within your own site for total Google SEO.