title: what is a sharepoint data layer?
body: <p>i need to understand a sharepoint project . this project has 3 components</p>
  
  <ol>
  <li>a sharepoint web application. </li>
  <li>a desktop air application</li>
  </ol>
  
  <p>these 1 and 2 exist over the 3rd component</p>
  
  <ol start="3">
  <li>a sharepoint data layer </li>
  </ol>
  
  <p>well this is what is described in the specifications of the project. </p>
  
  <p>what i understand is that the first two component are the applications which use data stored in the 3rd component. however the picture is not very clear what is the sharepoint data layer. does sharepoint also has a database part in it , which can be used to store data or what ?</p>