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There are 4 main types of automatic gearbox:
1) Automatic clutch - like a manual except the clutch operation is powered
2) Dual clutch - as 1 but the odd and even gears have their own clutches so change is quicker
3) Torque converter - uses oil to transfer torque between the engine flywheel and the gear mechanism
4) Continuously variable - uses an adjustable ratio belt drive instead of gears
Audi's tiptronic is type 3. I'm not sure if the ones without steering wheel paddles are still called tiptronic but they are the same, just that only the gear lever can be used for manual changes. I believe that all the 8 speed boxes are this type.
Audi's s-tronic is type 2.
Audi's multitronic is type 4.
I doubt that Audi do type 1 since type 3 effectively replaced that technology.