For millions of users, "Quick Look" is a definitive software feature. First introduced by Apple, it allows users to preview the contents of a file—whether it's a PDF, a high-resolution image, or a spreadsheet—without actually launching the associated application.

By simply hitting the Space bar after selecting a file in Finder, a window pops up showing a full-size preview.

In the world of law, "quick look" refers to a truncated version of the analysis used in antitrust cases.