Multitronic is a stepless transmission launched by AUDI AG in late 1999, jointly developed and manufactured by LuK. The capitalization used is multitronic and is a registered trademark of AUDI AG.

A continuously variable transmission (CVT) is an automated transmission that can change through a continuous range of gear ratios. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps. The flexibility of a CVT with suitable control may allow the engine to operate at a constant angular velocity while the vehicle moves at varying speeds.