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Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability.

OTP is a set of Erlang libraries, which consists of the Erlang runtime system, a number of ready-to-use components mainly written in Erlang, and a set of design principles for Erlang programs. Learn more about Erlang and OTP.

Learn how to program in Erlang.


There are several examples on the website to help you get started. The below example defines a function world/0 that prints "Hello, world" in the Erlang shell:


world() -> io:format("Hello, world\n").

Save the file as hello.erl and run erl to enter the Erlang shell to compile the module.

Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Eshell V8.2  (abort with ^G)
1> c(hello).
2> hello:world().
Hello, world

Learn more about the Erlang syntax of modules, functions and expressions on


Binary Distributions

Erlang/OTP is available as pre-built binary packages by most OS package managers.

apt-get install erlang

Compiling from source

To compile Erlang from source, run the following commands. The complete building and installation instructions can be found here.

git clone
cd otp
./otp_build autoconf
make install

Alternatively, you can use Kerl, a script that lets you easily build Erlang with a few commands.

Bug Reports

Please visit for reporting bugs. The instructions for submitting bugs reports can be found here.

Security Disclosure

We take security bugs in Erlang/OTP seriously. Please disclose the issues regarding security by sending an email to erlang-security [at] erlang [dot] org and not by creating a public issue.


We are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving Erlang/OTP. We appreciate your help!

Contribution Guide

Read our contribution guide to learn about our development process, how to propose fixes and improvements, and how to test your changes to Erlang/OTP before submitting a pull request.

Help Wanted

We have a list of Help Wanted bugs that we would appreciate external help from the community. This is a great place to get involved.


Erlang/OTP is released under the Apache License 2.0.


Copyright Ericsson AB 2010-2017. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.



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