"Reload" is important because it shortens the amount of time it takes for a page you have visited before to load.

If you have visited a page recently, all the buttons, graphics and images used on that page will be stored in your computer's local memory cache and do not have to be downloaded from the server (the computer that stores all these programs). It would take much longer for these pages to load if the images had to be downloaded off the server every time you went to a new page. Thus, the memory cache is a much more efficient way of handling recurrent graphics.

The "Reload" button comes in handy because it will quickly re-load the images stored in the memory cache back onto your screen as long as you have visited that page fairly recently.

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