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 # Introduction 

 Last update: 16.07.2025 

<a class="anchor" id="introduction"></a> The Rocky Solver SDK enables the development of custom modules for Rocky. A Rocky [module](glossary.xhtml#module) is a compiled library that attaches to the Rocky solver at strategic points during the simulation, allowing execution of custom code. For example, Rocky modules enable users to:

- Apply custom models to some simulated entities.
- Collect custom statistics during the simulation.
- Create custom post-processing data.

The Rocky Solver SDK comprises:

- Runtime libraries for binding to Rocky simulations at strategic moments.
- C++ header files that export types and macros related to the simulation state.
- Mechanisms to ease compilation of Rocky modules.