title: Why does Clojure have "keywords" in addition to "symbols"?
body: <p>I have a passing knowledge of other Lisps (particularly Scheme) from way back. Recently I've been reading about <a href="http://clojure.org/" rel="noreferrer">Clojure</a>. I see that it has both "symbols" and "keywords". Symbols I'm familiar with, but not with keywords.</p>
  
  <p>Do other Lisps have keywords? How are keywords different from symbols other than having different notation (ie: colons)?</p>