iOS 11 and macOS High Sierra introduced support for these new, industry-standard media formats:
* HEIF (High Efficiency Image File Format) for photos
* HEVC (High Efficiency Video Coding), also known as H.265, for videos
HEIF and HEVC offer better compression than JPEG and H.264, so they use less storage space on your devices and iCloud Photos, while preserving the same visual quality.
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