What is an image description?
An image description is a written caption that describes the essential information in an image.
Image descriptions can define photos, graphics, gifs, and video — basically anything containing visual information. Providing descriptions for imagery and video are required as part of WCAG 2.1 (for digital ADA compliance).
It’s sometimes referred to as alt text since the alt attribute is a common place to store them. The alt attribute appears in the HTML code like this: