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Apple designed CAF to be the audio container format with no limitations. While AIFF and WAV cap out at 4 GB, CAF has no practical file size limit. While MP4 audio (M4A) limits codec choices, CAF accepts anything: AAC, ALAC, PCM, MP3, Opus, even Apple's proprietary codecs. It's the format that audio professionals on Mac use when they need a container that won't get in the way.
You'll encounter CAF files in macOS and iOS audio workflows — GarageBand, Logic Pro, and iOS voice memos have all used CAF at various points. The format supports rich metadata, channel layouts for surround sound, and variable-length packets. It's technically excellent but entirely Apple-ecosystem.
Outside the Apple world, almost nothing opens CAF. VLC plays it on any platform. For universal compatibility, convert to WAV (lossless), FLAC (lossless, compressed), or AAC/M4A (lossy, small). FFmpeg handles CAF conversion cleanly.