Phoenix is ​​a web framework written in the functional programming language Elixir. And Elixir, in turn, is based on Erlang, uses the BEAM virtual machine and the OTP platform.

Largely due to the properties of the OTP language and platform, this framework allows you to get very good performance and provides high reliability. Using the Phoenix framework is most appropriate for projects with a high load and for projects that actively use web sockets: for example, collaboration systems, instant messengers, real-time dashboards with a high frequency of information updates.