All people like a good story. Especially when it comes to sales. Indeed, after a presentation, 63% of the listeners remember the story. Only 5% remember statistics. (Chip & Dan Heath)
Telling a story is one of the most effective ways to get someone's attention, and in doing so you are establishing a connection with the listener, helping you to identify with what you sell - your business, product, etc.
With this story, you will be showing potential customers the value and potential of the product, for example by demonstrating the use in their own company and how it has brought value to it.