here are some videos that will explain to u what cvt is. u ll also find out what advantages CVT has over conventional automatic transmission in which gears are shifted normally but just an electric motor is used
CVT explained - YouTube
(the driver cone is connected to the crank shaft, getting power from engine. the driven cone is connected to the axles and wheels of a car)
3D anitmaion of CVT Transmission - YouTube
CVT Cone Mesh Type - YouTube
check this out, seamless acceleration. no shifts.
2011 Nissan Maxima V6 3.5 Acceleration 0-180 CVT - YouTube
the disadvantages are that as gear ratios are being changed all the time, some of the hp/torque is lost... and it is said that cvt is too sensitive and cannot be used for powerful cars.