X for Y

A way entrepreneurs use to describe their startup to customers and investors so they can quickly grasp how their product works. It is done by comparing your startup to another successful company that likely pioneered its business model.

My startup is Airbnb for cars = people can borrow your car when you are not using it
My startup is Uber for food = food will be delivered to you on demand
My startup is Urban Dictionary for Silicon Valley = svdictionary.com