What are the differences between these drivetrains?

What are the differences between these systems:





1) Multi-Mode 4-wheel drive





2) Full-time 4-wheel drive





3) Electronic On-Demand 4-wheel drive





4) All-Wheel Drive





5) part-time 4-wheel drive





???|||For me would be like this:





1) Multi-Mode 4-wheel drive


The car usually have a transfer case and you have 2 options for 4WD setup, a regular 4wd and a reduction gear. A Jeep Liberty for example.





2) Full-time 4-wheel drive


The car doesn't have the option for a 2wd, but don't have a reduction gear. Subaru Impreza for example





3) Electronic On-Demand 4-wheel drive


The 4wd engage only when the front wheels loose traction. VW Golf R32 for example





4) All-Wheel Drive


The same of the number 2





5) part-time 4-wheel drive


The car uses only the 4wd when you want, otherwise the car runs as a 2wd. This kind of car don't have a reduction gear as well. The Ford Escape for example.