What are drive belts for?
are in general to drive a specific part of the engine. Most vehicles have several drive belts with each a different purpose.
The timing belt
is a rather special drive belt, which drives the tensioner pulley as well as the water pump
The other drive belts are the driving force behind car parts
including the alternator
, the ac compressor or the PAS pump for example. This drive belt is also known as the v belt
or the alternator belt.