The wheel alignment checks if the geometry angles of the wheels are correct, intervening when necessary. It is a very important check because it prevents uneven tread wear, it guarantees a perfectly straight drive and gives the driver a trusting relation with the steering wheel.
It’s unbelievable how many times we’ve heard stories of incorrectly tightened (or not at all) wheel nuts from other tyre shops. Frankly, the lack of attention to customer safety is… well, nuts. That’s why we double check every wheel, every nut.