The Core Audio Format (CAF) is an audio container format that was developed by Apple Inc. and introduced in Mac OS X 10.4. CAF is designed to support a wide variety of audio formats, including compressed and uncompressed audio data, as well as text annotations, markers, and other metadata. CAF files can contain audio data using various codecs such as PCM, MPEG-4 AAC, Apple Lossless, and others. The format also supports multichannel audio, high-resolution audio, and various metadata that can be embedded within the file. CAF files are commonly used by developers of audio applications on macOS and iOS platforms, and can be played back using various software, such as QuickTime Player, VLC, and other media players that support the CAF format. One notable feature of CAF is its support for seamless audio looping, which allows a portion of the audio file to be looped without introducing any audible clicks or glitches at the loop points. This makes CAF a popular format for creating audio loops for use in music and game development.