title: Adding files to git index without committing
body: <p>When using Git, my workflow usually involves firing up TortoiseGit and selecting the files that i'd like to commit.</p>
  
  <p>This (i assume) runs <em>git add</em> (?) and commits these changes to the local repo.</p>
  
  <p>My question is -- why is the separation between ADDING files to the index and COMMITTING them needed?</p>
  
  <p>Are there any use cases for simply adding files to the index without committing them at the same moment?</p>