What does the 'S line' designation mean on an Audi A3?

I noticed that some Audi A3 models have the 'S line' designation. What does this mean and how does it affect the car's performance and features?

The 'S line' designation on an Audi A3 signifies that it is a sportier and more performance-focused version of the base model. This typically includes upgrades to the suspension, steering, and exterior design elements.

In addition to the performance upgrades, 'S line' models also tend to have a more luxurious interior with features such as leather seats and a premium sound system.