title: what's the difference between command cw and ciw in Vim?
body: <p>Here's <a href="https://stackoverflow.com/questions/14233498/replace-word-under-cursor-vim">a link</a> I find in stackoverflow about this question.</p>
  
  <p>but I still cannot understand without a specific example about what's the difference between "change inner word" and "change word".</p>
  
  <p>I test these two commands in my vim and finally find no differences ,Please give me an example to help me understand, thank you!</p>