Alias

In macOS, an alias is a small pointer file that contains a dynamic link to another file (the original).

Usage
An alias can be created in the Finder by selecting the target file and selecting "Make Alias" from the File menu. Aliases can be dragged into the Dock for quick access. The original file can be moved within the same file system and the alias will typically be able to resolve the link, unless the file is deleted or moved to another unknown file system. An alias to a file in another file system, such as a server or external drive, may also fail if the drive is disconnected.

History
Aliases were introduced in System 7 and were displayed with a small arrow added to the icon and an italicized filename. The concept was also adopted by Microsoft in Windows 95 as "shortcuts". In Mac OS X (now macOS) alias names are no longer italicized, but a small pointer arrow is still displayed in the icon.