title: Difference between "id" and "_id" fields in MongoDB
body: <p>Is there any difference between using the field ID or _ID from a MongoDB document?</p>
  
  <p>I am asking this, because I usually use "_id", however I saw this sort({id:-1}) in the documentation: <a href="http://www.mongodb.org/display/DOCS/Optimizing+Object+IDs#OptimizingObjectIDs-Sortbyidtosortbyinsertiontime">http://www.mongodb.org/display/DOCS/Optimizing+Object+IDs#OptimizingObjectIDs-Sortbyidtosortbyinsertiontime</a></p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Turns out the docs were wrong.</p>