title: What is the difference between "extends" and "include" in Jade?
body: <p>With both of these commands I can use code from another file. As I see it when we use <code>extends file.jade</code> we can use <code>block</code>, to change blocks in <code>file.jade</code>  before the compilation. But is it the only difference and am I right?
  Thank you.</p>