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What is the differance between a two wheel and four wheel drive?

A car with two wheel drive only has two wheels turning, either the two front wheels or the two rear wheels.
A car or SUV with four wheel drive has all four wheels turning, the front wheels and the rear wheels are generally turning.
4 wheel drives are typically on trucks or SUV's, but there are quite some cars with four wheel drive also. four wheel drive offers far better traction in all types of ruff road conditions, like snow, mud and deep sand.

A two wheel drive uses only two wheels for power when a four wheel drive uses four wheels

There are more differences than you could ever list here.

A two wheel drive could get stuck in the mud while the four wheel drive could be able to get through it. because all four wheels are spinning.

2 wheel drive = rear wheels move you forward and backwards with the power of the engine and trans


4 wheel drive=All four wheels move you forward and backwards
with the power of the engine and trans

along with only using two wheels for power, two wheel drives have a weaker power train. A four wheel drive has more power in the four wheel drive setting, not only because you're using four wheel power but a increased horse power ranking also.

Two wheel car is a car where the power to move is either powered by the front or the rear trucks wheels only one set of whels moves. A four wheel drive car is where all four wheels are powered to move the car and all four wheels turn. there's also all wheel drive which isn't a four wheel drive car, is where power to the a 3rd or 4th wheel are engaged in some restrictions but the driveshaft is constantly moving making it an all wheel drive.

This is a list of most four wheel drive systems:
There are two basic types of four wheel drive systems, 1st you have what is usually called a Part Time system in which the front and rear drive shafts are locked together this system is good really only for sand, snow and other loose materials and not for driving on roads. A Full Time four wheel drive system is intended for use on roads due to addition of a center differential which will let the drive shafts to turn at different speeds. The two systems portrayed above may be had with a two speed move case which will have a low range for steep grades. An All wheel drive system is the same as above but without the low range.

Comparing same cars with the 2wd and 4wd: the 4wd has a better acceleration speed to 60 mph 100 km/h, however the 2wd will catch up with it on a longer track and has a better max speed.
Furthermore the 4wd will consume more fuel, but it's more comfy to drive it.

a four wheel drive can supply more torque because it has four tyres of available traction giving it an edge in slippery surfaces.
however a two wheel drive is more fuel economical because it has lesser mechanical friction to overcome.

Two Wheel Drive is good if you live in the South where the weather does not get nasty.

Four Wheel Drive is helpfull when there's ice on the road or heavy rain.

two wheel faster four wheel slower