Alignment is necessary when the vehicle is observed to pull to the right or left on a straight road, does not recover easily after a turn, and generally exhibits an erratic driving behavior. Alignment is required when the wheels show convergence or divergence from each other beyond what is prescribed by the manufacturer.
The causes of the problem can be a bump in a pothole, which may have caused a problem in the front system of the car, the bump caused damage to the tire, the tire pressure when parking on the pavement, wear and tear and damage to the mechanical parts and the post links.
The result of bad alignment is the unclear course of the car, dangerous braking, dangerous straight line and cornering, high tire wear and general destabilization of the car's handling.
The alignment of the wheels should be done preventively every 15,000 kilometers or whenever this is deemed necessary by the workshop.