The Cirrus Logic CS4206B (AB 98) is an audio codec chip used in computers to handle audio processing. It is part of the CS4206 family, which is typically used in consumer laptops, desktops, and motherboards for providing high-definition audio output (stereo, surround, etc.) and input (microphone, line-in, etc.). The "AB 98" designation might refer to a specific version or revision of this codec, but generally, it is a part of the audio system that works with your operating system to deliver sound.