Unique Selling Proposition is something that differentiates you or your personal brand amongst other competitors. It makes you stand out from the many other people in the market. Every brand wants to leave a mark with their services or products. This is the only thing which will give you an edge. I'll explain this using an example. Take Domino's. They started the trend of fast pizzas. The company said that if you order a pizza from them, you'll get it in 30 minutes. And if not so, you'll get it for free! No one was using this strategy that time. This made news and helped them garner a lot of customers.