Like Lisp, it's a programmable programming language. Like Smalltalk, the original Forth was a self-contained programming environment with full source that you c

Like Lisp, it's a programmable programming language. Like Smalltalk, the original Forth was a self-contained programming environment with full source that you can hack on the fly. (This particular Forth system isn't the best example of that.) Unlike either, it's lower-level; except for things like embedded systems you're unlikely to prefer it to get stuff done. It's most notable for being super-simple to implement on bare metal.