A simplest answer:::
Auto:
A conventional automatic transmission has a fixed number of rations (gears), which it changes between. In this respect it is similar to a manual transmission.
CVT:
A continuously variable transmission, also known as a CVT, uses a belt to allow the vehicle access to an unlimited number of gear positions. This has several advantages, such as improving the fuel economy of the vehicle.
How to Identify:
When driving a car with a CVT, you never hear or feel the transmission shift. It simply raises and lowers the engine speed as needed, calling up higher engine speeds (or RPMs).
Other Methods:
* Vehicle Technical Specifications by manufacture