Simplifying your product practically ↵

We spent two weeks designing and creating an iPhone app. I sent an email to my mum with the name and the one line description of the app. She wrote back a single sentence: "I don't get it." We threw out the code and the product and started over.

and

If you cannot describe your product in one sentence, you cannot sell it. People don't want to listen to you explain, they just want a simple and clear answer to the question: What does it do? If you need two sentences to answer that, then you are in for trouble.