An alt tag describes what is in an image on a website and its function on the page. Screen readers for the blind and visually impaired read out this text to make an image accessible. Alt tags and title tags strengthen the message towards search engine spiders to improve the visibility of the site within search engines. The alt and title attributes of an images are commonly referred to as alt tag or alt text and title tag.
Source: HSMAI CHDM Study Guide
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