In it's most basic form, a wheel alignment consists of adjusting the angles of the wheels so they are perpendicular to the ground and parallel to each other.  

 

The purpose of these adjustments is maximum tyre life and a vehicle that tracks straight and true when driving along a straight and level road. 

 

Wheel Alignment is often confused with Wheel Balancing.  

 

The two really have nothing to do with each other except for the fact that they affect ride and handling. If a wheel is out of balance, it will cause a vibration at highway speeds that can be felt in the steering wheel and/or the seat. 

 

If the alignment is out, it can cause excessive tyre wear and steering or tracking problems.