It’s for languages that don’t need compiling, I.E. javascript, HTML, CSS, Python, Ruby, Forth, Ant, APL, AutoHotkey, AutoIt, BASIC, DATABUS, DM, Eiffel, FPr, GML, Groovy, Haskell, J, Julia, Lisp, LPC, Lua, MUMPS, Maple, Mathematica, MATLAB, Orel, earlier Pascal’s, PCASTL, Perl and many, many more!