Toe

Front Toe-in
Stabilizes the car in the straights, adn coming out of turns.
It smoothes out the steering response, making the car very easy to drive;

Front Toe-out
Increases turn-in steering a lot.
But can make the car wandery on the straights;

Rear Toe-in
Stabilizes the car greatly. It makes the rear end 'stick', but more toe-in makes the difference between sticking and breaking loose bigger.

Rear Toe-out
Rear toe-out is never used. It makes the rear of the car very, very unstable.