Continuously variable transmissions, or CVTs, are a type of transmission that trades the fixed-ratio gears of conventional automatic transmissions for a system involving two pulleys and an intervening belt or chain, which can infinitely vary gear ratios in real time. CVTs are hardly new; Subaru marketed the first stateside example in the late 1980s. But their usage spans a wide range of automakers: Mitsubishi, Nissan and Subaru employ CVTs heavily across their U.S. lineups, while Honda, Hyundai, Kia and even GM have adopted such transmissions for their smaller engines.
Related: Which Cars Have CVTs for 2020?