Google Now is a service on phones and now iPad which does stuff like take note of where you are, where you go frequently so that it can do things like set your default work place so that you can always access maps for it quickly or show you restaurants nearby. It doesn’t actually have the supermarket as its best guess for where I work but it’s certainly in the region. I don’t even know where it’s guessing I work just that it’s downtown in an area I don’t go to often.