What is OTP?

OTP (Open Telecom Platform) is the standard library and set of design principles bundled with Erlang for building reliable systems. It's not a separate product — it ships with the language and supplies battle-tested behaviors (reusable process templates) so teams stop reinventing server loops, supervision trees, and finite state machines by hand.

The core building blocks include:

• gen_server — generic client/server process
• supervisor — monitors and restarts child processes
• gen_statem — generic finite state machine
• application — packaging and lifecycle for a deployable unit

Using OTP behaviors means your business logic plugs into a well-tested process skeleton instead of hand-rolling message loops, which is why virtually all production Erlang systems are built on top of it.

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