Framebuffer/Color Buffer?

Question

Can someone point out to me if both of them are the same? I mean I have been reading info about it and this redbook here says

"The color buffer itself can consist of several subbuffers. The framebuffer on a system comprises all of these buffers" here

Is framebuffer then like a virtual buffer consisting of all the actual buffers?(like depth/stencil etc)

Answer 1

The framebuffer contains (often) the depth, stencil, color, and accumulation buffers. The color buffers are the most important part, but they are only one part. You can create more color buffers, and you can also create more framebuffers in OpenGL.

When you say "virtual framebuffer" that sometimes means a framebuffer which is not drawn to the screen (e.g., it is written to disk, or used as a texture). I believe this terminology is specific to X11, not OpenGL.