An extended validation or EV SSL certificate lets a website’s visitors know that it is secure. The green color shown in the address bar, similar to the green color shown on a traffic light, indicates that the visitor can safely proceed when performing a monetary transaction. This type of certificate is the most advanced type of SSL certificate currently available, and a person who wishes to buy an EV SSL certificate needs to have credentials verified by a strict process.

Some browsers no longer show the traditional gold padlock to indicate that the information submitted on the page is secure. Instead, the green color in the address bar lets the user know that the site meets very strict security measures. The user can hover a mouse over the green color on the address bar to view information regarding the ownership of the website and the certification authority (CA).

For More info : http://bit.ly/EV_SSL