What is Caster & Camber (automobile)?

Camber angle is the measure in degrees of the difference between the wheels vertical alignment perpendicular to the surface. If a wheel is perfectly perpendicular to the surface, its camber would be 0 degrees. Camber is described as negative when the top of the tires begin to tilt inward towards the fender wells. Consequently, when the top of the tires begin to tilt away from the vehicle it is considered positive.

Caster defined as the angle created by the steerings pivot point from the front to back of the vehicle. Caster is positive if the line is angled forward, and negative if backward.

caster & camber is an angle which is used to denote the wheel alignment.

caster angle is nothing but an axis of the steering mechanism is perpendicular to the wheel.there are two possibilities one is positive and another one is negative.positive caster is  steering axis inclined towards the rear wheel.then negative caster is steering axis inclined towards the front.

camber angle is nothing but an tilt the wheel inward and outward, if  the wheel axis tilted towards the inside when we are looking from front it is called negative camber,  when the wheel axis tilted towards the outside it is called positive camber. 

when the negative top begin to tied inward and caster is the angle created by the pivot point from the front to the of the vehicle

Caster:

Caster is the tilt of the steering axis of each front wheel as viewed from the side of the vehicle. Caster is measured in degrees of an angle. If the steering axis tilts backward—that is, the upper ball joint or strut mounting point is behind the lower ball joint—the caster angle is positive. If the steering axis tilts forward, the caster angle is negative. 

Camber:

Camber is the tilt of the wheel from true vertical as viewed from the front of the vehicle. Like caster, camber is measured in degrees of an angle. If the tire appears to tilt outward at the top, the camber angle is positive. If the top of the tire tilts inward, the camber angle is negative.