Internal anchor texts are the clickable text in a hyperlink leading to other parts of your site.
Anchor texts give search engines and users an indication of what to expect when they click on a link on a website. Not only do descriptive anchor texts improve your visibility on search engines, but they also improve the usability of your website. They are an important part of on-page SEO.
If you subscribe to Siteimprove SEO Pro and SEO Enterprise you are provided with details of your websites internal anchor texts, allowing you to check that texts are unique and keywords are used effectively.
If you have questions regarding your subscription or want to upgrade, please contact your Customer Success Manager directly or submit a ticket.