What is the Keyless Entry System on an Audi A6 and How Does It Work?

I am looking to purchase an Audi A6 and I noticed that it has a keyless entry system. Can someone explain how this feature works and if it is reliable?

The keyless entry system on an Audi A6 is called the 'Advanced Key'. It uses Radio Frequency Identification (RFID) and Near Field Communication (NFC) technology to communicate with the car's door locks. As long as you have the key fob on you, you can unlock the doors by simply touching the handle. You can also lock the doors by pressing a button on the handle. It is a reliable feature and is more convenient than traditional keyless entry systems.