what is alt tag

actually when google crawler crawl all the site and fetch the all the information then where it found image it is don't know what is this so to tell the crawler that it is the keyword relate to this in main things alt tag is used to tell google that it is the keyword and then crawler used that image as keyword after put this alt tag in image
 
The ALT tag is an attribute that allows you to add descriptive text which can be crawled by search engines. The purpose of the ALT tag is to describe the image. In SEO, the importance of the ALT tag ability to help your web page rank and if you choose to have images indexed, increase your exposure through image
 
An alt tag is a html tag that is writtern "alt="internet guide". Alt tags are usually attached to a graphic image so that when the graphic is loaded into the browser and a user hovers the cursor over the graphic, text will be displayed. For example if you hover the cursor over the Internet Guide image on his page in the top left hand corner it should display "internet guide". Alt tags can be picked up by search engine spiders and can help the ranking of a web site page.
 
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