Internal linking involves connecting pages within a website through hyperlinks. It is an important factor for SEO and digital marketing as it can increase website traffic from search engines by creating a deeper internal linking structure. The best internal links connect one article or content-heavy page to another to spread linking naturally throughout the site. There are several strategies for link building, including directory submissions, guest blogging, testimonials, and creating a video channel. These strategies can help increase traffic and recognition but require ongoing effort to generate quality backlinks.