Erlang was designed around a set of requirements for telecom systems. They were distributed, massively concurrent systems which had to scale with demand, be capable of handling massive peak loads and never fail. Erlang's features make it perfect for multi-core computers, although it pre-dates them, and for the Internet Age and the Cloud although it pre-dates them as well. This talk will describe how Erlang was developed as a language and system to solve that could solve these problems. It truly demonstrates the benefits of concurrency–oriented programming.