title: What's the difference between a UIStackView And A UICollectionView in Xcode 7?
body: <p>What's the difference between a <code>UIHorizontalStackView</code> and a Collection View(Also Vertical stackview)?</p>
  
  <p>Can't a <code>collectionView</code> be horizontal and vertical? Why would people use both?</p>
  
  <p>What does a <code>UIStackView</code> do that a Collection View can't?</p>