Images are a wonderful method for making a web site more attractive and also gets the attention of the the actual users of your site. However Serach Engine bots can not read any text within an image or dertimine what the image actually is, so from stand point of Search Engine Optimization we must construct our images with an alt="Text Here" so that a search engine can have some text to help determine what the image is.

Here is an example of a image  properly form for search engine optimization: 

<img src="example.gif" alt="keywords goes here">

The alt="keywords goes here" is a wonderful method of SEO that allows us to incorpete Keywords in our images. 

Images Searches 

Many Search engines also have a method of searching the web for images. So we can also utilize the actual name of the image as a means of Search Engine Optimization. 

For Example:

<img src="Chocolate-Labrador-Retriever.jpg"  alt="Chocolate Labrador Retriever">

Incorperting keywords in image names should not be overused. For example if our page contains elements such as header.jpg, footer.jpg or any image used in the actual construction of the theme of your site should not contain keywords in the actual file name. Researve this method of optimization for images that can actually be descriped with a name or short phrase.