Forth is a stack-based programming language known for its simplicity and efficiency. It was created in the 1970s by Charles H. Moore for controlling computer hardware and embedded systems. Forth uses a postfix notation, meaning operators follow their operands, which allows for concise and flexible coding. The language is designed to be extensible, enabling users to define new words (commands) easily. This feature makes Forth suitable for a variety of applications, from operating systems to real-time control systems. Its minimalistic nature allows it to run on limited hardware, making it popular in embedded systems development.