Let's us a physical metaphor: Think about a US three-pin power outlet. This power outlet has two asymmetric rectangular sockets, and one half-capsule ground socket.
That's the interface. There's a lot of other stuff inside the plug, and the circuit it's connected to could be built in different ways, but in order to build a device that attaches to this kind of socket, you only really need to know what the outlet looks like, so you can build a matching plug,
NB Queen of the Onster Farm
The reviews are in!
"not terrible" -dirt
"a wise, impartial party" -Crystal
Onster Farm is the official Mastodon instance of Doctective Jake Peralta. In this house, we use alt text.