Imagine a world in which the make of car you drove determined which store you could drive to. You can only drive to one store, and you can only buy things from that store. To get things from a different store, you'd have to buy a new car or wait until a version was available in your store. So you hop in your Honda and head to the Honda store to buy bananas, a new sweater, and a new set of golf clubs for your dad.
The bananas are great, but the only sweater is mauve and your dad drives a Toyota, so he can't use those golf clubs. He needs Toyota-enabled golf clubs.