The term "48 kHz" refers to a sample rate used in digital audio recording and playback. It indicates that 48,000 samples of audio are taken per second. This sample rate is commonly used in professional audio settings, such as film and television production, because it provides a good balance between sound quality and file size. Using a sample rate of 48 kHz allows for a wider frequency range and better audio fidelity compared to lower sample rates. It is often preferred for capturing high-quality sound, making it suitable for various applications, including music production and sound design.