RPM is an indication of how fast your lathe can turn. This is important to know so that you can choose the right type of lathe for your budget and see if it will fulfill your needs
The higher the number of revolutions per minute, the more powerful a lathe will be. A 50RPM lathe may not be as useful as a 60RPM lathe, but it can still do basic woodworking tasks just fine.
cnc lathe turning aluminum rpm