Lisp is worth learning for the profound enlightenment experience you will have when you finally get it. Born in 1958 at MIT, Lisp is the second-oldest high-level language still in use. It pioneered garbage collection, first-class functions, the REPL, and homoiconicity—the principle that code is data.

These roots spawned Scheme in 1975, an elegant academic dialect. This evolved into PLT Scheme, later renamed Racket in 2010. Today, Racket champions language-oriented programming, letting developers build custom syntax in an afternoon. Though Lisp machines faded during the AI winter, variants thrive: Clojure runs major fintech platforms, Common Lisp powers flight planning and Emacs, and Guile configures entire Linux distributions.

Setup takes minutes via racket-lang.org. Launching DrRacket provides a definitions pane paired with a live REPL. Used for formal verification, typography, and global education, Racket remains a vital platform for language research. Its enduring legacy shows how early innovations continue shaping modern development.