title: Are pull requests part of Git, or a feature of tools like GitHub, Gerrit and Atlassian Stash?
body: <p>Pull requests seem to be the common way to do code review with Git. However, it is not clear whether this term means the same when using the built-in <code>git request-pull</code>, or a different tool.</p>
  
  <p>Are pull requests an intrinsic function of Git, or is it a common term for tools like GitHub, Gerrit or Atlassian Stash?</p>
  
  <p>Is the discussion and "result" of the code review stored in the Git commit history or in a separate database?</p>