Anchor text are clickable, colored (usually blue) text that indicates a hyperlink, for our purpose we may use anchor links when you have a newsletter composed of several topics. Anchor links will allow you to have a bar or lists of topics in your newsletter and a person clicks it and it takes them directly to that portion of the campaign where the clicked-on link topic is located 

Anchor text are important for search engines and algorithms because it provides relevant information about where the link leads. Anchor text is changed using the HTML or CSS code. We find anchor links can be used throughout many web-based platforms.

Help Document: How To Create Anchor Links In ActiveCampaign

Please note when using AnchorLinks in ActiveCampaign it is not supported on multiple email clients, as mentioned: "Anchor links are not supported in some email clients: iOS Gmail app, iOS Apple Mail, Outlook app on Android, Outlook app for macOS and AMP Emails."