Download/Upload speed

Does any one know what the difference is between the 2, if you don't know what im talking about is there are 2 speeds for transfer rate, and they usually say different things, and i have had smart ftp for about 5 months and i think its the best ever, but thats the only think i can not figure out though. Any help is good.

The difference between the two is average and current speed(s).

oh wow that makes sence, thanks so mutch.