title: What exactly does framebuffer mean in Vulkan
body: <p>I'm a little fuzzy on the concepts of RenderPass, Image, and Framebuffer, especially FrameBuffer, but is it a piece of memory for storing pixel data or not, and if so, how is it different from Image?
  Or does the rendering flow like this:
  The rendered pixels are stored in Framebuffer first, and then in Image?</p>