title: Unmanaged memory and Managed memory
body: <p>what exactly are <code>un-managed</code> and <code>managed memory</code>?
  can anybody explain me in brief?</p>
  
  <p>Also, what exactly would mean when the managed-memory concept is taken to RAM, calling managed-RAM. What are some of the specifics about "managed RAM" and "un-managed-RAM"?</p>