Some interesting facts

• WhatsApp messaging system is build on Erlang, it supports over 800 million users and 30 billion messages per day

• bet365 uses Erlang in their Online Gambling & Betting industry.

• Erlang transports 40% of all telecom data

• Erlang can be used in everywhere on the backend

• 3 of the leading banks are built on Erlang

• 2 of the leading blockchains are built on Erlang

Example of Hello World code written in Erlang compared to other languages

Erlang

-module(hello).
-export([hello_world/0]).
hello_world() -> io:fwrite("hello, world\n").

After this is done, you'll need more work. Save it as hello.erl and compile it from the erlang shell. Don't forget the full-stop ("period" in American English) at the end of each command, as shown:

    Erlang (BEAM) emulator version 4.9.1 [source]
    Eshell V4.9.1  (abort with ^G)
    c(hello).
    {ok,hello}

(on Unix systems you start the erlang shell by typing "erl" at the command line. On Windows, open a command prompt window and type "werl", or find the Erlang icon in the programs menu). To run the program from the Erlang shell:

    hello:hello_world().
    hello, world
    ok

JavaScript

"use strict"  // This declares strict mode and using it is a good security practice.
console.log("Hello world!");  // semicolon is not mandatory but recommended

Kotlin

fun main(args: Array<String>) {
    println("Hello world!")
}

Python

print "Hello world!"

Ruby

puts "Hello world!"