Big companies like WhatsApp and Discord use Erlang and its modern counterpart, Elixir, for scaling real-time applications. Erlang's virtual machine (BEAM) and its focus on lightweight processes, message passing, and fault tolerance make it ideal for handling massive concurrency and high availability. Elixir builds on Erlang's strengths with a more modern syntax, making it easier to develop scalable, reliable apps. These companies leverage Erlang and Elixir to manage millions of users and ensure minimal downtime, showcasing the power and efficiency of these technologies.
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