On the level that matters to the driver:
All wheel drive is designed to be used on roads.
“Full time” 4-wheel drive is designed to be used on and off road. In practice this usually means that full time 4wd includes a “low” setting.
“Part time” 4-wheel drive is designed to only be used in “4 wheel” mode when the traction is really bad (off road, snow, etc).
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