Fortran is a general purpose programming language widely used by the scientific computing community.

Originally named FORTRAN during its early years, it is now referred to as Fortran. This is valid for Fortran90 and onwards.

The file extensions associated with this language are: .for, .f, .f90, .F, .F90, .f95, .F95. The capitalized extension means the source code include macro ifdef statement for the C preprocessor.