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Runs on the Erlang Virtual Machine, also known as the BEAM. Erlang was built for scalability and fault tolerance of telephone switches by Ericsson in the 80's.

Give this a watch, "The Soul of Erlang and Elixir". Covers a lot of what's nice about the underlying platform.

https://youtu.be/JvBT4XBdoUE

This is a great video for introducing Elixir/BEAM.

Binary pattern matching is great for working with protocols.

Erlang process monitoring makes it very easy to handle client disconnects.

And Elixir makes using Erlang a bit more approachable.

I completely agree with chasers's points. Moreover, Elixir's excellent concurrency support and its fault-tolerant nature make it well-suited for handling a high number of connections, ensuring our connection pooler's reliability.