Most people lives in a home and of course those homes have doors, a front door, and sometimes also a back door. Nobody will be surprised to hear that those doors are locked, and that you as a stranger have to knock on the door, if you want to enter their home.
In the early days of home computing it was the habit, that if you had to connect some service outside your home you would use your Modem and dial a special phone number and after ending your transactions, this one to one connection disconnected and that was it.
Nowadays we are almost full - time connected to everybody else in the world via the World Wide Web. Millions and Millions computers and we have no clue who they all are.
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