title: What Is the difference between pre-compiled headers and pre-compiled binaries
body: <p>Wiki reference mentions that some headers can sometime contain large amount of source code and hence having them as pre compiled headers will save compilation time. 
  <a href="https://en.wikipedia.org/wiki/Precompiled_header" rel="noreferrer">https://en.wikipedia.org/wiki/Precompiled_header</a></p>
  
  <p>if precompiled header can contain compiled source code then how is it different from pre compiled binaries.</p>