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HEIF (High Efficiency Image Format) is a versatile image file format designed for improved compression, resulting in high-quality images with smaller file sizes compared to traditional formats like JPEG. Developed by the Moving Picture Experts Group (MPEG), HEIF supports a wide range of features including transparency, 16-bit color depth, and the ability to store multiple images in one file, making it suitable for live photos and burst photography. However, its adoption has been gradual, and not all software and devices support HEIF files natively, which can necessitate conversion for broader compatibility.

ICO is a file format used to store icons on Microsoft Windows. It supports images of various sizes and color depths, and it can contain multiple images within a single file, allowing icons to be displayed in different resolutions and color depths depending on the user’s settings. While ICO files are essential for creating application and file icons in Windows, they are less commonly used for other purposes due to their specific functionality and limited support on non-Windows platforms.