title: What is a dangling commit and a blob in a Git repository and where do they come from?
body: <p>I'm looking for the basic information on dangling commits and blobs.</p>
  <p>My repository seems fine. But I ran <code>git fsck</code> for the first time to see what it did and I have a long list of 'dangling blobs' and a single 'dangling commit'.</p>
  <p>What are these things?  Where did they come from?  Do they indicate anything unusual (good or bad) about the state of my repository?</p>