Quick Look allows Finder and various other apps to preview files quickly.

The feature first appeared in in Mac OS X Leopard (10.5).

To see it in use: in Finder, select a file and press the space bar – or choose Quick Look from the File menu. It has a quicklookd - background process or daemon that generates and catalogs files to store thumbnails so the system responds rapidly to requests to quickly look at files.

history | excerpt history