title: Why is JSON important?
body: <p>I've only recently heard about JSON (Javascript Object Notation).
  Can anybody explain why it is considered (by some websites/blogs/etc) to be important?
  We already have XML, why is JSON better (apart from being 'native to Javascript')?</p>
  
  <p>Edit: Hmm, the main answer theme seems to be 'it is smaller'. However, the fact that it allows data fetching across domains, seems important to me. Or is this in practice not (yet) much used?</p>