title: Difference between "grid" and "pack" geometry managers
body: <p>What's the main difference between the Tkinter geometry managers <code>grid</code> and <code>pack</code>?</p>
  
  <p>What do you use for your projects ?</p>
  
  <p>If <code>grid</code> is better to align object, what the main purpose of <code>pack</code>?</p>