http://www.copyblogger.com/content-marketing-glossary/
USP
In essence, a Unique Selling Proposition is something that you offer customers or clients that your competitors do not offer. It’s the “remarkable benefit.”
In the late 1970s, FedEx effectively branded itself as the fastest, most reliable shipping service with its “When it absolutely, positively has to be there overnight” tagline.
That was the remarkable benefit no other company could claim.
And once you identify that unique element for your business, you’ll know exactly what the theme of your content marketing should be, because that will become the big story of your business.
