Guys, recently I have discovered the topic related to image site map. I don't know about this. Can any one take me deep in this topic? Thanks in advance.
Sure, it's just an XML sitemap with all images listed. (Only supported by Google though, not e.g. Yahoo and Bing) Here's an image sitemap tutorial. Just submit to Google Webmaster Tools when created.
Now you can use a Sitemaps extension to provide Google with exactly this information. For each URL you list in your Sitemap, you can add additional information about important images that exist on that page. You don’t need to create a new Sitemap, you can just add information on images to the Sitemap you already use.
Image is a simple picture of anything. the other word is site map, it's a map. so, image site map is map of any site.
images of your websites are mapped in sitemap format of xml that you could submit to google for crawling.. make name seo friendly for the images that could really drive handsome traffic..