title: Scalable VS Extensible
body: <p>I'm not sure if this type of question is allowed here, but it is related to software projects.</p>
  
  <p>Is there a difference between scalable and extensible?</p>
  
  <p>Is extensible a sub-set of scalable? I.e. Scalable (extensible)</p>
  
  <p>Some regard it as the same, others regard it as different. What are the differences?</p>
  
  <p>I am led to believe:</p>
  
  <p>Scalable - make the system withstand more usage (bandwidth etc...) AND make it larger.</p>
  
  <p>Extensible - add more functionality to the system.</p>
  
  <p>Are they not the same?</p>
  
  <p>Edit: If extensible is adding more functionality to the system and scalable can be deemed as making a system larger, is that not theoretically the same, proving that extensible is just a sub-set of scalable?</p>