alt text

the text that (sometimes) appears when you hover over an image on a website, usually just briefly describing the image that you are looking at.

Person 1: *hovers over a random image- hey! I see text there! Wonder what it's called...
Person 2: it's called alt text you idiot
Person 1: really? *looks for alt text for 2000000000000 other images
Person 2: *sighs- really?