All application software packages are written in computer languages. There are various computer languages like C, C++, FORTRAN and Pascal. Each language is best suited for a particular application.
C and C++ languages are used to develop highly complex software. FORTRAN is used for scientific applications
Each language has its own vocabulary. There are some packages like FoxPro, MS Access and Sybase that are more English-like. Thus, even non-computer professionals, like executives and managers who have never studied computer science, can learn to use these languages.
Since each language has its own vocabulary, each language differs from the other.