In every swap chain there are at least two buffers. The first framebuffer, the screenbuffer, is the buffer that is [[Rendering (computer graphics)|rendered]] to the [[output]] of the graphics[[video card or a variety of other locations for further processing depending on the environment the client application is running in]]. Each time new [[Film frame|frame]] is displayed, the first back buffer in the swap chain takes the place of the screenbuffer, this is called 'presentation' or '''swapping'''. A variety of other actions may be taken on the previous screenbuffer and other backbuffers (if they exist); it may be erased from memory, or returned to the frontback of the swap chain for further processing. The action taken is decided by the client application and is API dependent.
