Wikipedia
The Finder is the default file manager and graphical user interface shell used on all Macintosh operating systems Described in its "About" window as "The Macintosh Desktop Experience", it is responsible for the launching of other applications, and for the overall user management of files, disks, and network volumes It was introduced with the first Macintosh computer, and also exists as part of GS/OS on the Apple IIGS It was rewritten completely with the release of Mac OS X in 2001 In a tradition dating back to the Classic Mac OS of the 1980s and 1990s, the Finder icon is the smiling screen of a computer, known as the Happy Mac logo
Finder_(software) - Wikipedia, the free encyclopedia