Spotlight is without a doubt, one of my favorite technologies in Mac OS X. I’ve been a fan every since it was first introduced with Mac OS X 10.4 “Tiger”. Spotlight, at it’s core, is essentially a database or an index of all the files on your hard drive.
The user facing part of spotlight lets a user query this index and get results almost instantaneously. In fact, I’ve gotten so used to spotlight, I’ve almost forgotten those days when we used to meticulously keep our important files in various folders and maintain the folder structures religiously, lest we save a file in some folder and can’t find it later. With spotlight, I never have to worry about folders. I just type a few letters of the filename or even it’s content, and spotlight will invariably get me the correct file.