Where it happens. Where the buy decision is executed.
Like...at the cash register check-out stand at the grocery store. That's a point of sale. You slip your card into the Ingenico or whatever brand reader. It's connected to a bank. It clears your transaction, takes your data, and then you move on down the line with melons, rice, and a dozen eggs grown free range with low-stress chickens who do yoga.
Point of sale used to be a constrained industry held only inside of physical retail stores, airports, and other places people visited in person. But now, mobile commerce, done mostly through Amazon, has changed the whole notion of what that "point" is.
So for now, just think about it as the IP address from which you were tying into the internet and clicking to buy. As you do yoga with the chickens.
