Alt represents?

Answer 1

The required alt attribute specifies an alternate 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).
https://www.sololearn.com/discuss/221017/?ref=app
https://www.sololearn.com/learn/HTML/1030/

Answer 2

we use alt for the purpose when a image cannot be displayed on the webpage.
syntax -
<img src ="a.png" alt="a house">