SWIG is a tool for making it easy to expose C/C++ code for use from a variety of high level programming languages. The idea is to feed C/C++ header files into SWIG and SWIG then generates the 'glue' code so that your C/C++ library can be used from another language such as Python, Java, C#, Ruby, Perl etc. Currently, there are implementations for supporting over 20 different target languages.