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Forth is an interactive, stack-oriented programming language created in the late 1960s and early 1970s at the National Radio Astronomy Observatory. Forth's extensibility enables it to be used as both a programming language and an operating system. The language uses postfix notation and Reverse Polish Notation (RPN) — with operators following their operands — which reduces the need for parentheses. This simplifies parsing at the expense of not mirroring typical mathematical expressions. Memory management strategies include direct access to memory locations without manual garbage collection or dynamic allocation, reducing overhead but requiring careful code review to prevent memory leaks or overwriting unintended memory areas.

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