Javascript line of code in plain english

Question

There is this line of code that is on most of our pages that I'm trying to figure out what it's for and if I can remove it.

It looks like this:

<script type="text/javascript">
  /*<![CDATA[*/
  if(top!=self){top.location.replace(self.location.href);}
  /*]]>*/
</script>

I know it's probably a silly question, but what is this line of script trying to say. Could this be related to the sign in functionality?

Thanks in advance

Answer 1

if (top != self) { // if the top frame isn't this window
    top.location.replace( // set the top frame's location
        self.location.href // to this window's location
    );
}