A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analog computers.
Differentials can also provide a gear ratio between the input and
output shafts (called the "axle ratio" or "diff ratio"). For example,
many differentials in motor vehicles provide a gearing reduction by
having fewer teeth on the pinion than the ring gear.
https://en.wikipedia.org/wiki/Differential_(mechanical_device)
Bevel gears are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well.[1] The pitch surface of bevel gears is a cone, known as a pitch cone. Bevel gears transfer the energy from linear to vertical power, making it very useful in machines widely used in mechanical settings.
https://en.wikipedia.org/wiki/Bevel_gear
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