R is a language and environment for statistical computing and graphics. R is similar to the award-winning S system.
It provides a wide variety of statistical and graphical techniques (linear and nonlinear modeling, statistical tests, time series analysis, classification, clustering, ...).
R is designed as a true computer language with control-flow constructions for iteration and alternation,
and it allows users to add additional functionality by defining new functions.
For computationally intensive tasks, C, C++ and Fortran code can be linked and called at run time.