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Alignment Angles

What is your mechanic talking about when he says your toe angle is off? There are four basic alignment angles:

Toe
Toe In - Front of tires are shorter distance than rear tires across the axle
Toe Out - Rear of tires are shorter ­distance than front of tires across the axle
 Effects:    
    Most important angle for tire wear
    Excessive toe will wear tires quickly

Caster
Caster - Tilt of the steering axis to the front or back
 Effects:
    Helps with directional stability
Cross caster - The difference in caster from side to side
 Effects:
    Can cause the vehicle to pull to the lesser side

Thrust
Path or track of the rear axle compared to the centerline of the vehicle
 Effects:
    May cause a pull or lead to one side
    May cause a crooked steering wheel