Your internal links can help make sure that all of your pages are seen by search engine spiders, build on the keyword density within the site, increase the PageRank of your internal pages and ultimately increase your site’s overall ranking.
An internal link allows you to link to another section of the same website, so basically moves the page up or down to the desired position. This is useful for the user to quickly access the information he / she is seeking.
An internal link is a hyperlink that is a reference or navigation element in a document to another section of the same document or other documents that may be on or part of the same website or domain. In articles like this, the words highlighted in blue are examples of internal links.