Toe - the direction in which the wheels are pointing. Adjustments to toe affects the handling of the car. Common setups are is neutral + neutral, front-toe out + neutral rear or front-toe out + toe-in rear.
Toe out - when the leading edge of the tyres are further apart than the trailing edge. If you want the car to turn in better one can increase toe out on the front wheels.
Toe in - opposite of toe out. Causes the car to carry on in a straight line.