Internal Links, as the name suggests, are hyperlinks pointing one page to another page on the same domain. Internal links help to create a web of web-pages for a website which helps search engines crawl the website with ease. It is true that external links add value to your website but they do so only for the pages they are being linked to. With the help of internal links, you can pass on some of that value to the other pages of your website which might not be getting much value from external links pointing to them. This makes internal links highly supportive for new web pages of your website.