A continuously variable (automatic) transmission uses drive belts in order to transmit torque and allows for various stepless ratios. In otherwords there are more gear ratios than your ordinary automatic transmission. One of the more interesting features of the system is that it often emulates the traditional feel of an abrupt gear change, paticularily at low speeds. This is due to the fact that most drivers expect the sudden jerks while a smooth transmission might appear to show a lack of power!
There are many different types of CVTs: