Ever been surfing the web and find a nice bit of text you want to save? You can highlight the text with your cursor, copy, and paste into an app like Text Edit or Notes, sure, but maybe you just want a quick and easy way to put the bit of text aside to use later.
There’s no need to bother with opening an app and pasting in the text in OS X. Text clipping has been around for quite a while, but it’s a feature that we rarely use, for one reason or another.