Erlang is about:

• Processes and lightweight concurrency
• Process isolation (REALLY isolated)
  • Processes share nothing and copy everything (no locks/deadlocks)
• Fault tolerance and error handling
• Distributed programming
• Asynchronous communication (cheap)
• Simple language (hmmmmm .....)

1. VERY lightweight processes
   1. Hundreds of thousands on commodity hardware
2. Functional (functions can accept or return functions!)
3. Ports (='Processes' for communicating with the outside world) are how Erlang communicates to hardware.
4. I/O is also way to interface to outside world.
5. I/O sits between the outside and the port to try to communicate with both.

1. Look at nanite (uses RabbitMQ)

1. CouchDB