What is the function or the job of alt""/> in the code of insertion of pic in html

Question

advice for beginner

Answer 1

https://www.sololearn.com/learn/HTML/1030/
it gives description on your image when your image fail to load

Answer 2

yes you can omit it if you don't want the description

Answer 3

can i omit this part as i dont care about the description ?