These are the tags that tell what a .gif or .jpg is. Adding ALT (Alternative) descriptions to your IMG tags is quick and easy. You don't have to do any complex HTML coding.
An example of a ALT tag looks like this:
<img src="images/services-pic.jpg" width="100" height="78"
ALT="description here">
If you use images in your Web pages, its good practice to include Alt text for every image that a visitor to your site will see. ALT tags filled with keywords can also be used to boost your keyword frequency and help you achieve better rankings.
Image ALT tags also make your site more accessible to visually impaired people using text readers. Even if your Website is content rich, the alt tags allow you to reinforce what is highly important, the key terms, within the content.
The overall impact of using ALT tags, in terms of search engine optimization, is low. As they have become abused by webmasters who fill alt tags with streams of keywords, the major search engines have lowered the importance of ALT tags in their algorithms. However, ALT tags are a required element for standards-based HTML coding. Every image must have an ALT tag, and each ALT tag must be properly implemented.
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