Benefit of using 'Alt' attribute inside Image tag.

'alt tag' is one of most useful tags because it allows disabled and blinds to listen to what is written behind images.

So the more you write in alt tag [alternative tag] you are providing a sort of service to the their community, and hey the good thing is Search Engine Bots and Browsers understand your image better when you use this tag that is it helps search engines to locate your image easily. Ain't it cool or what.

Try this:
Disable images and see what the picture below looks like, Instead of picture "the text written in alt tag will appear" - That's what I'm talking about Genius!

Go to options - Content - [uncheck; tick should not appear] Load images automatically (this will happen in Firefox) and Now you'll read instead of seeing the image because you've unchecked the images.

Code

<img src="http://i.imgur.com/ABB8j.jpg" alt="muwasalat - muwasalat.com - birdy" </img>

Output