The alt attribute specifies an alternative text for the image, if it cannot be displayed.

<a href="https://quizful.com/">
<img src="IMAGE ADDRESS IS NOT SET DELIBERATELY"
alt="quizful-logo" width=100% height=100%>
</a>

Anyway, the alternative text works as a link.
The required alt attribute specifies an alternative text for an image, if the image cannot be displayed.
The alt attribute provides alternative information for an image if a user for some reason cannot view it (because of slow connection, an error in the src attribute, or if the user uses a screen reader).

Without src attribute with alternative text

there will be only a clickable broken link displayed: