An alias file on macOS is a special type of file that acts as a pointer or a shortcut to another file or folder. It is conceptually similar to a Windows shortcut (.lnk file) but offers more robust capabilities within the macOS environment. When a user double-clicks an alias, the operating system automatically resolves the alias and opens the original item it points to. Alias files are particularly useful for creating convenient access points to frequently used files, applications, or directories without duplicating the actual data, thus saving storage space. Unlike a simple symbolic link, a macOS alias stores more comprehensive information about its target, including its path, inode number, and volume information. This allows an alias to often 'find' its original file even if the original is moved or renamed, as long as it remains on the same volume. If the original file is moved to a different volume, the alias might break, but macOS often provides a mechanism to re-link it. Alias files are visually distinct in the Finder, typically displaying a small curved arrow icon on their icon. They are a fundamental part of the macOS user experience for organizing and navigating files efficiently.