title: What is "object" in "object file" and why is it called this way?
body: <p>I was asked a question: "What is an 'object file'?".</p>
  
  <p>After looking at <a href="http://en.wikipedia.org/wiki/Object_file"> Wiki</a>, I only know that it contains <strong>objects</strong>.</p>
  
  <p>But what are those objects and why someone called them that way?</p>