What is alt="" in image continent

Question

sir can't understand what is alt=""

Answer 1

If the browser fails to load the image then it will display the content enclosed in alt tab.

Answer 2

It's descriniption :P

Answer 3

HTML alt attribute to define an alternate text for an image, if it cannot be displayed.
More information here:
https://www.w3schools.com/tags/att_alt.asp .