What is rolling Forecast and why is it used? What are some new development in this ?

Found a useful link in this regards. please share your views

http://www.cashfocus.com/what-is-rolling-forecast.htm

In the rolling forcast you drop the ended period and replace it with a new future period to keep the total rolling period constant

Rolling forecast is a process to update the forecast periodically (mostly quarterly).

The latest is using rolling forecast to derive rolling budgetting and rolling operations planning.