title: What's the concept of and differences between Framebuffer and Renderbuffer in OpenGL?
body: <p>I'm confused about concept of Framebuffer and Renderbuffer. I know that they're required to render, but I want to understand them before use.</p>
  
  <p>I know some bitmap buffer is required to store the temporary drawing result. The back buffer. And the other buffer is required to be seen on screen when those drawings are in progress. The front buffer.
  And flip them, and draw again. I know this concept, but it's hard to connect those objects to this concept.</p>
  
  <p>What's the concept of and differences of them?</p>