Qualifying? Not being a wiseass, but do you watch any racing on TV?
A day or two before the race starts, each car gets a few laps to run solo. The driver with the fastest time gets to start first on the grid (also known as "the pole"), and each car after that is placed in the order of their time. This puts the quickest cars at the front so the field spreads out better at the start.
In GT3 you can run qualifying laps to set your position the same way.