Internal Link term explained
Internal link is a hyperlink on a website leading to another page of the same resource. All the internal links form the internal link graph of the site.
Using internal links can influence the redistribution of Link Weight (Link Juice) among the individual resource page. It is necessary to link to more relevant sections or articles. This redistribution of weight is called linking and is widely used by experienced SEOs as a part of internal optimization.
Internal links also help users of the site to simplify navigation, enable you to have access to any part of the resource and accelerate the entering of a visitor to a specific section. Proper internal linking is not only influence to search engines, but also care about users because it is one of the components of usability.