Tires are one of the most necessary parts of the car. It carries the weight of the entire vehicle taken down the road and absorbs vibrations from different road surfaces to the car body. Good or bad handling of the vehicles depends on tire condition, too. Correct tire pressure is, therefore, very vital. If it is too high or too low could cause unsafe driving.
If over-inflating the tire, it will cause wear at the center section of the tires. The tire will only partially touch the road surface. The edges of the tire are less worn because it does not contact the road throughout the tire surface.
And vice versa, if the under-inflated tire will cause the center of the tire not being able to touch the road. Therefore, causing the tire to wear out only on the edge of the tire. Besides more fuel consumption, inflating the tire will cause the sidewall to move up and down more than usual. It may cause the tire to heat up and explode if running at high speed.
You must keep tires air pressure at the proper spec as advised by the car or tire maker.