What is the alt = ""
it is also useful for visually impaired users that use screen readers. it "describes" what's on the screen
it comes to display a text, the text you will write between the quotes, in the browser, when the image cannot be displayed. This is useful to prevent the sitiations when your image will not be recognise : if the image format is not supported, if the file is corrupted, if the path to find it is wrong, etc ...
OK thanks friend