title: What does it mean Bootstrap is compiled?
body: <p>I'm learning web-technologies and programming languages. Start learning about frameworks and other stuff. Looking at Bootstrap Front-End Framework. Some details I don't got about this thing. </p>
  
  <p>On official web page it says you can download compiled and sources of Bootstrap. I don't get it, how can Front-End development be "source" and "compiled", ain't they just scripts that browser interprets?</p>