Erlang!

Telecommunications needed a special language to handle the heavy load of users (concurrency), and it’s become an industry standard. It was designed by the top dog in telecom, Ericsson.

Other communication companies have seen its value and taken advantage. Discord chat with its instant messaging currently handles more than 5million concurrent users. They also use Erlang and one server can handle 500,000 which is huge considering a standard server on one port can handle roughly 16,000.

Hope this information is helpful to you