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Reference.org
Foreign function interface
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<p>A foreign function interface (FFI) is a mechanism by which a program written in one <a href="/facts/Programming_language/cWTYbgWa">programming language</a> can call routines or make use of services written or compiled in another one. An FFI is often used in contexts where calls are made into a binary <a href="/facts/Dynamic-link_library/vySyC1dz">dynamic-link library</a>. </p>