The real difference between a continuously variable transmission (CVT) and an automatic transmission (AT) is that while both are technically automatic transmissions and don’t require the driver to use a clutch to manually change gears, a traditional automatic transmission has fixed gears -typically ranging from five to nine in number. Nissan's XTRONIC CVT and all CVTs don’t have any traditional fixed gear ratios at all. There is no “shifting” in the conventional sense of the word.