What is Alt=""? Why is it is used?

Answer 1

The text you give for alt is shown in place of an image in case it can't load. It's also read out by text-to-speech.

Answer 2

Only some of all previous frequently threads about 'alt', easily finbale:

https://www.sololearn.com/Discuss/211454/what-is-alt-why-is-it-is-used
https://www.sololearn.com/Discuss/204043/what-is-the-use-of-alt
https://www.sololearn.com/Discuss/189759/i-don-t-understand-how-to-use-alt-attribute
https://www.sololearn.com/Discuss/174259/what-is-the-use-of-alt-alternative-text
https://www.sololearn.com/Discuss/173395/what-is-the-use-of-alt-in-the-img-tag
https://www.sololearn.com/Discuss/167688/why-do-you-use-alt-in-the-image-tag
https://www.sololearn.com/Discuss/156085/what-is-alt
https://www.sololearn.com/Discuss/152163/does-anyone-know-about-alt-stands-for-and-how-it-works
https://www.sololearn.com/Discuss/151381/what-is-alt-someone-explain-me-its-use-please
https://www.sololearn.com/Discuss/139467/what-is-alt-for

... and so much more on ^^