Internals of the manual transmission have a number of gears you can pick depending on your pace and driving conditions. Greater gears supply more velocity rather then torque, which happens to be great for clean  driving within the freeway.  Automatic gearboxes appeared commercially in the 1940s, according to the Worldwide https://gearboxauto75296.onesmablog.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox-auto-74228113