Wheel Alignment is sometimes referred to as tracking but strictly speaking the two are not the same service.

Tracking is quite an outdated process of an era when cars had very little adjustment that could be made and the process was generally only applied to the front two wheels.

Alignment is applied to all four wheels and refers to a more complex process than tracking in that the wheel angles are adjusted in order to reduce tyre wear, and to ensure the vehicle travel is straight and true, thus also improving fuel efficiency and handling.

These principles have slightly different rules for specialist applications such as motorsport and this process is then referred to as a set up or geometry set up (sometimes simply geo) and more information can be found here.