Motor vehicle comprising - a communication device for a wireless data transmission between, on the one hand, the motor vehicle and, on the other hand, a vehicle-external appliance and/or another motor vehicle, - a processor device configured to execute application programs in a first communication zone, which is configured to perform, using the communication device, a data interchange between, on the one hand, the application programs and, on the other hand, the vehicle-external appliance and/or the other vehicle, and - a memory device for vehicle control data that stipulate a driving behaviour of the motor vehicle, wherein the memory device is arranged in a second communication zone of the motor vehicle, wherein the first and second communication zones (K1, K2) are coupled via a monitoring device which is configured to forward to the second communication zone new data that an application program attempts to transmit from the first communication zone to the second communication zone, only if the monitoring device recognises that the new data result in a safe driving behaviour of the motor vehicle that is defined by a prescribed safety criterion, characterized in that a) a plurality of preinstalled, selectable characteristic maps is stored in the motor vehicle and the monitoring device is configured, on the basis of the new data, to enable and so activate at least one of the preinstalled characteristic maps for use as vehicle control data in the motor vehicle, and/or b) the monitoring device is configured, on the basis of the new data, to perform a simulation for a driving behaviour that results from the new data and to forward the new data only if an admissible driving behaviour is obtained in accordance with a predetermined plausibility criterion, and/or c) wherein, in the motor vehicle, a third communication zone coupled to the first communication zone via the monitoring device is provided, the third communication zone having a memory for vehicle-related and/or person-related secret data for an online payment and/or for an online service, wherein the monitoring device is configured to permit data access from the first to the third communication zone (K1, K3) only with a valid authentication code. - a communication device for a wireless data transmission between, on the one hand, the motor vehicle and, on the other hand, a vehicle-external appliance and/or another motor vehicle, - a processor device configured to execute application programs in a first communication zone, which is configured to perform, using the communication device, a data interchange between, on the one hand, the application programs and, on the other hand, the vehicle-external appliance and/or the other vehicle, and - a memory device for vehicle control data that stipulate a driving behaviour of the motor vehicle, wherein the memory device is arranged in a second communication zone of the motor vehicle, a) a plurality of preinstalled, selectable characteristic maps is stored in the motor vehicle and the monitoring device is configured, on the basis of the new data, to enable and so activate at least one of the preinstalled characteristic maps for use as vehicle control data in the motor vehicle, and/or b) the monitoring device is configured, on the basis of the new data, to perform a simulation for a driving behaviour that results from the new data and to forward the new data only if an admissible driving behaviour is obtained in accordance with a predetermined plausibility criterion, and/or c) wherein, in the motor vehicle, a third communication zone coupled to the first communication zone via the monitoring device is provided, the third communication zone having a memory for vehicle-related and/or person-related secret data for an online payment and/or for an online service, wherein the monitoring device is configured to permit data access from the first to the third communication zone (K1, K3) only with a valid authentication code.