This is a procedural language without type checking that features interactive execution of commands and offers the possibility to compile sequences of commands for later use. Forth is mostly used in embedded systems that require interaction with hardware. 

Forth is a procedural, stack-based programming language and interactive environment designed by Charles H. 'Chuck' Moore and first used by other programmers in 1970. Although not an acronym, the language's name in its early years was often spelled in all capital letters as FORTH, but Forth is more common.