Getting good rankings and SEO on selected keywords is about thousands of details that should work correctly. As with external links to a website, internal links are essential when building and working with a website.
What are internal links?
The internal links are about links from a page in a domain and link the pages within the same domain. They consist of an anchor text, i.e. what is visible on the link and where the page should point. You should try to make sure that a specific anchor text points to the same page.
The image shows the average load of indexed pages. As a website grows, some pages will be poorly linked to the most important pages.
The links provide a better user experience.
Internal links provide a better user experience from a user perspective as they are found in breadcrumbs, page navigation, related links, and different types of sorting. It also means that you get visitors to stay longer on the site and decrease your bounce rate.
The internal links are essential for SEO
The internal links give a signal of how the site is structured and how the pages are interconnected. Internal linking is a factor that helps Google when their spider indexes the site. Like external links, they analyze your site structure to understand which pages are essential and how they are connected. The links help to establish the architecture of the website and spread what is called link juice.
It is essential to segment a website because some pages are more important than others. You need to build semantic silos and make sure that these are connected and link to each other to spread the link juice.