Definitions for "ALT Tags"
Keywords:  hover, img, mouse, curser, tag
A means for creating text for images by describing in words what a picture depicts.
used to display a short text description of an image when the pointer is hovered over it. Using keywords in ALT tags increases keyword density as seen by robots.
The HTML tags describing an image that appears when the mouse is rolled over the image or if the image is not available. Helpful for people who view pages in text-only mode. Some search engines look for keywords in ALT tags - though they generally carry a low weighting