Audio CODECs, short for "Coder-Decoder," are used for encoding and decoding digital audio signals. They are crucial components in audio systems, enabling the conversion of analog audio signals to digital format for processing and transmission, as well as decoding digital audio back into analog signals for playback through speakers or headphones. Basic Audio CODECs with standard audio quality and fewer features are generally more affordable, while high-end CODECs with advanced functionalities command higher prices. When purchasing Audio CODECs, consider your application's audio quality requirements, the number of audio channels needed, interface compatibility with your system (analog, digital, USB, I²S), and any additional features like DSP for audio processing. Verify the CODEC's sampling rate, resolution, signal-to-noise ratio (SNR), power consumption, and compatibility with audio standards such as PCM, MP3, AAC, etc.