Basically, the idea is that it can become any type of server you’d like. The actual function to run the server is passed by the client and the Erlang process effectively morphs into that server after constructing it using the provided function. When you consider Erlang’s hot reloading abilities, this simple architecture becomes even more powerful. Another way to look at it is that the Erlang process is just compute waiting for work to do and the work is to run full-blown servers. Pretty neat.