Internal linking is important for SEO because it helps pass SEO ranking benefits to the targeted SEO words in the link anchor text.
For example, if I hyperlink “adopt dogs” to the Humane Society’s adopt a dog page: https://www.animalhumanesociety.org/adoption/dogs, then the corresponding landing page gains SEO prominence and better rankings for the keyword “adopt dogs.”
On small, medium and Enterprise websites, internal linking helps promote brand awareness, and SEO visibility for important products and for the Brand.com.