When I did the tutorials some weeks ago, I also had difficulty understanding Signals. In the time, it made more sense to me if it was called "Streams" instead,

When I did the tutorials some weeks ago, I also had difficulty understanding Signals. In the time, it made more sense to me if it was called "Streams" instead, as I'm used to the concept of signals and slots from Qt, where a signal is an event that your widgets dispatch and slots are the functions that react to signals. These subscriptions from Elm kind-of remind me the signals and slots mechanism of Qt..