Updated: May 1, 2019
According to Bridgestone Tires:
[A] Tire alignment, also known as wheel alignment, can help your tires perform properly and help them last longer.
It can also improve handling and keep your vehicle from pulling in one direction or vibrating strangely on the road.
Alignment refers to an adjustment of a vehicle’s suspension – the system that connects a vehicle to its wheels. It is not an adjustment of the tires or wheels themselves. The key to proper alignment is adjusting the angles of the tires which affects how they make contact with the road.
To sum it up: