Which feature can be used to provide descriptive text displayed when the email viewer hovers over each link?

The feature that allows for descriptive text to be displayed when the email viewer hovers over each link is known as a link tooltip. Tooltips are commonly used in web design and email campaigns to provide additional context or information about a link without cluttering the user interface. When the viewer hovers over the link, the tooltip appears, offering a brief description or other pertinent information related to that link. This enhances user experience by giving more clarity on what to expect when clicking the link.

In contrast, link help text, while it may sound relevant, does not specifically refer to the hover function and can imply assistance instead of the hover feature. Link conversion tracking and link tracking alias pertain to monitoring and analyzing link performance and user interaction rather than the visual or descriptive elements presented when hovering over a link. Thus, the link tooltip is the precise feature that meets the criteria of providing descriptive text displayed on hover.