After the sensor is exposed, the image data will be processed in the camera and then written to the
storage card.
A buffer inside a digital camera consists of RAM memory which temporarily holds the image information before it is written out to storage card. This speeds up the "time between shots" and allows burst (continuous) shooting mode. The very first digital cameras didn't have any buffer, so after you took the shot you HAD to wait for the image to be written to the storage card before you could take the next shot.
