title: Difference between 3-tier and n-tier architecture
body: <p>My professor said, that adding multiple layers in the BLL, will make the 3-tier an n-tier architecture.</p>
  
  <p>But from my understanding (I may be wrong), a tier is a physical separation, and a layer is a logical seperation, so adding multiple layers will still keep it a 3-tier application, wouldn't it?</p>