
CIDER is the Clojure IDE and REPL for Emacs. It is built on top of nREPL, the Clojure networked REPL server and replaces the direct use of nREPL in Emacs.
In this article we are using CIDER that is packaged in Emacs Live, a very complete, well organised and extensible configuration for Clojure and many other things in Emacs.