* Serpentine Belt: This is the most common type, a single long belt that drives multiple accessories like the alternator, power steering pump, air conditioning compressor, and water pump. It's *often* on the driver's side, but not always.
* Drive Belt (or Timing Belt/Chain): This belt (or chain) drives the camshaft(s) and is crucial for engine timing. Its location varies greatly by engine design; it might be on the driver's side, but it's not always.
Therefore, without knowing the specific make, model, and year of the vehicle, it's impossible to say definitively what the belt on the driver's side is called. It's most likely the serpentine belt, but it could be a different belt entirely.
