What do the different Audi models stand for?

I'm looking to purchase an Audi and I'm confused about the different model names. Can someone explain what each model stands for?

The letter after the number in Audi models represents the car's drivetrain. For example, 'A' stands for front-wheel drive, 'S' stands for all-wheel drive, and 'R' stands for rear-wheel drive.

The number in Audi models indicates the power output of the engine. The higher the number, the more powerful the engine.

The model name also often corresponds to the car's body style. For example, 'A3' is a hatchback, 'A4' is a sedan, and 'Q5' is an SUV.