The alignment of your wheels has an effect on how your tyres wear. A correctly aligned wheel will wear your tyres evenly. However, if your wheel alignment is not correct your tyres will wear prematurely on either the inner or outer edge.
Most vehicle setups allow all 4 wheels to be adjusted. However, some vehicles have rigid rear axles meaning only the front wheels can have the alignment adjusted.
*Other factors can also affect tyre wear i.e. pressures.
As well as tyre wear, incorrect wheel alignment has an effect on how your vehicle handles. Effects of misalignment include your vehicle pulling to one side, your steering wheel sitting off centre or requiring more effort to centralise after turning.
Misalignment can be caused by impact, for example clipping a kerb or going through a pot hole. It can also be caused by worn suspension components or modifications.
Wheels misaligned toeing in will cause excessive wear on the outer edges of the tyres.
Wheels misaligned toeing out will cause excessive wear on the inner edges of the tyres.