Alt” Meaning

“Alt” is short for “alternative.” In everyday tech talk, it usually refers to the text that shows up if an image can’t load on a website, or it can mean the Alt key on a keyboard that you press to trigger shortcuts.

People use “Alt” all the time without thinking. When you post a photo on Twitter and add a short sentence so screen-readers can describe it to blind users, that sentence is the alt text. On a PC, you might press Alt + Tab to jump between open apps, or Alt + F4 to close a window. In both cases, “Alt” is just the quick helper standing in for something else.

Meaning & Usage Examples

• Alt text: A 10-word description under an Instagram photo so search engines and screen readers know what’s in it.
• Alt key: Hold Alt and hit Tab to flip through your open windows in Windows.

Context / Common Use

Web designers add alt text to every image so Google can index it and visually-impaired visitors still get the picture. Gamers and office workers lean on the Alt key for fast combos like Alt + Enter to fullscreen a game or Alt + Space to move a stuck window.

Question

Is alt text the same as a caption?

No. A caption appears on the page for everyone to see; alt text is hidden in the code and only shows if the image fails to load or is read aloud by assistive tech.

Question

Can I skip alt text on decorative images?

Yes. If an image is pure decoration, leave the alt attribute empty (alt=””) so screen readers ignore it.