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| influenced by = [[Ada (programming language)|Ada]], [[C Sharp (programming language)|C#]],<ref name="chplspec">{{cite web|title=Chapel spec (Acknowledgments)|url=http://chapel-lang.
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'''Chapel''', the '''Cascade High Productivity Language''', is a [[parallel programming language]] that was developed by [[Cray]],<ref>{{cite book |title=Modular programming languages: 7th Joint Modular Languages Conference |url=https://archive.org/details/modularprogrammi00ligh |url-access=limited |first=David E. |last=Lightfoot |year=2006 |isbn=978-3-540-40927-4 |page=[https://archive.org/details/modularprogrammi00ligh/page/n27 20]}}</ref> and later by [[Hewlett Packard Enterprise]] which acquired Cray. It was being developed as part of the Cray Cascade project, a participant in [[DARPA]]'s [[High Productivity Computing Systems]] (HPCS) program, which had the goal of increasing [[supercomputer]] productivity by 2010. It is being developed as an [[open-source software|open source]] project, under version 2 of the [[Apache license]].<ref>{{cite web |title=Chapel license information |url=http://chapel-lang.
The Chapel compiler is written in [[C (programming language)|C]] and [[C++]] ([[C++14]]). The backend (i.e. the optimizer) is [[LLVM]], written in C++. Python 3.7 or newer is required for some optional components such Chapel’s test system and c2chapel, a tool to generate C [[language binding|bindings]] for Chapel. By default Chapel compiles to binary executables, but it can also compile to C code, and then LLVM is not used. Chapel code can be compiled to libraries to be callable from C, or Fortran or e.g. Python also supported.
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