Clickjacking attack allows to perform an action on victim website, Mostly social networking sites are targeted.

when an attacker uses multiple transparent or opaque layers to trick a user into clicking on a button or link on another page when they were intending to click on the the top
level page. Thus, the attacker is “hijacking” clicks meant for their page and routing them to other another page, most likely owned by another application, domain, or both. It may be similar to CSRF Cross Site Request Forgeries Attack. 
Using a similar technique, keystrokes can also be hijacked. With a carefully crafted combination of stylesheets, iframes, and text boxes, a user can be led to believe they
are typing in the password to their email or bank account, but are instead typing into
an invisible frame controlled by the attacker.

Example :
 iframe { /* iframe from */
  top:0; left:0;
  filter:alpha(opacity=50); /* in real life opacity=0 */

<div>Click on the link to get promoted:</div>

<a href=”; target=”_blank” style=”position:relative;left:20px;z-index:-1″>CLICK ME!</a>

<div>You’ll get promoted!!</div>


Click on the link to get promoted:
Click Me
You'll be promoted!!


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