What is alt text?
Alt text (alternative text) describes the appearance or function of an image on a page. Alt text is read aloud by screen readers used by visually impaired users, displays in place of an image if it fails to load and is indexed by search engine bots to better understand the content of your page. Also known as "alt attributes," “alt descriptions," or technically incorrectly as "alt tags,” alt text used within an HTML code or in the appropriate field in your CMS (Content Management System.)
Adding Alt Text to the images on your Marketplace Product Listing will help you communicate more information about your products to potential buyers.
Best practice when adding Alt Text
Simply describe what is in the image as specifically as possible. Keep it (relatively) short. Avoid over-stuffing the same keywords. It is not necessary to include "image of," "picture of," etc.
Read more about Alt Text here:
https://moz.com/learn/seo/alt-text
Adding Alt Text to your Images
Go to the Photos & Videos part of your Marketplace Product Listing page
Click the pencil on the Add alt Text hover
Follow the instructions in the pop up box
Enter Alt Text within the character limits: minimum 100 and maximum 140 characters
What to look for in your Photos and Video section