When taking a photo on a DSLR, the image sensor sends the image data to the camera’s buffer. The buffer is an area of memory built into the camera where image data is processed (and compressed) before being sent to the memory card. The size of the camera buffer affects how many photos can be taken in a given amount of time. High-end DSLR cameras have continuous or burst shot modes, taking photos in quick succession. The speed and number of photos are dependent on the speed and size of the buffer.