title: What does it mean "We use C++/C as backend"
body: <p>What does it mean when people say we use C++/C as backend. 
  Lets say facebook for instance whereas frontend is php.
  How can one bind any other lang to c++/c?</p>
  
  <p>My context is web.</p>
  
  <p>For instance user using a web site...Its agreeable to think that o/p is generated by php using templating..</p>
  
  <p>but how is database/caching/web services/business logic etc implemented in c++/c</p>