Message-passing concurrency that works locally or over a network, with some fault-recovery stuff baked in. At least, that's the intersection of Erlang's coolnes

Message-passing concurrency that works locally or over a network, with some fault-recovery stuff baked in. At least, that's the intersection of Erlang's coolness and ZeroMQ's coolness. Really, though, to me that's not the greatest part of Erlang. The great part of Erlang is more that the VM supports lightweight threading, so you can create a vast number of threads and program by message passing, and bugs can be met with micro-reboots by supervisors.