title: What are SingletonMethods and InstanceMethods in Ruby
body: <p>I see a lot of stuff </p>
  
  <pre><code>include ActiveRecord::XXXX::InstanceMethods
  extend ActiveRecord::XXXX::SingletonMethods
  </code></pre>
  
  <p>I am unaware of the property or there working, just wanted a easy to understand answer.
  if it has a good reason to be used.</p>