Drive Systems are when single wheels are used to transfer energy from one part of a device to another. There are a few ways they can be aligned. There is the wheel-to-wheel drive system. Here if one is turned clockwise, the other turns counter-clockwise. The two wheels can be moved apart, making it a belt drive system. Depending on the alignment of the belt, the wheels can be made to turn the same direction or opposite. For both types, if the wheel has cogs, we know it better as gears. 
Mechanical advantage can be created when one wheel is larger than the other.
This is best explained by thinking about a multi-geared bicycle. If you need advantage to go up a hill, you'd switch gears so that the chain goes on the largest cog on the rear tire. This allows you to keep your pedals turning even if your rear tire is not rotating that fast. If you want the advantage of building speed, you'd switch the gears so that the chain goes on the smallest cog on the rear tire. This allows you to pedal slower but have your rear tire go faster!
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