Quick Look, first introduced in 2007, is an instant preview feature on the Mac operating system that lets you view files and folders without opening them up. Just highlight a file, like a picture or text document, then press the spacebar on your keyboard to get a speedy preview of it. You can use Quick Look to preview photos, videos, music, PDFs, spreadsheets, word documents, and more—even from the trash can. If there's no real preview available, there will be an option to open the file up ...
