An internal link is a link from one page on a website to another page on the same website. These links are used to navigate between different pages on the website and to provide users with a way to discover more content on the site.

Internal links are important for several reasons:

1. They help to improve the user experience: Internal links make it easier for users to navigate and find the information they are looking for on the website.
2. Link equity is the value that a link passes on to the linked page, and they can help to distribute this value throughout the website, which can help to improve the visibility and ranking of other pages on the site.
3. They help search engines to discover and index new pages on the website and understand the structure and hierarchy of the content.
4. They help to establish the theme of the website by linking to relevant pages on the site, which can help to improve the visibility of the website in search results for relevant queries.

In summary, an internal link is a link from one page on a website to another page on the same website. They help to improve the user experience, distribute link equity, help search engines to discover and index new pages, and establish the theme of the website.

1. Use descriptive and relevant link text: Use descriptive and relevant link text when creating internal links, this will help search engines to understand the context and relevance of the linked page and improve the visibility of the page in search results.
2. Use keyword-rich anchor text: Using keywords in the anchor text of internal links can help to improve the visibility of the linked page in search results for those keywords.
3. Create a logical and intuitive navigation structure: A logical and intuitive navigation structure will make it easy for users and search engines to find and understand the content on your website.
4. Link to deep pages: When creating internal links, it’s important to link to deep pages, rather than just the homepage. This will help to distribute link equity throughout the site and improve the visibility of the deep pages.
5. Use breadcrumb navigation: Using breadcrumb navigation can help to improve the visibility of deep pages by showing the path that the user took to get to the page.
6. Use a sitemap: Creating a sitemap and submitting it to search engines can help to improve the visibility of your website by making it easier for search engines to discover and index your pages.
7. Use internal linking to highlight important and new content: Use internal linking to highlight important and new content on your website, this will help to improve the visibility and engagement of the content.
8. Use tools to track your internal linking: Use tools like Google Search Console, Ahrefs, SEMrush, and Majestic to track your internal linking and identify any issues that may be harming your website’s visibility.

In summary, internal linking is an important aspect of SEO, it can help to improve the visibility of your website in search results by creating a logical and intuitive navigation structure, using descriptive and relevant link text, using keyword-rich anchor text, linking to deep pages, using breadcrumb navigation, using a sitemap, and highlighting new and important content.