This presentation is about the sprite sheet.
In computer graphics, a sprite is a two-dimensional bitmap that is integrated into a larger scene. Originally sprites referred to independent objects that are composited together, by hardware, with other elements such as a background. This occurs as each scan line is prepared for the video output device, such as a CRT, without involvement of the main CPU and without the need for a full-screen frame buffer. Use of the term sprite has expanded to refer to any two-dimensional bitmap used as part of a graphics display, even if drawn into a frame buffer (by either software or a GPU) instead of being composited on-the-fly at display time. The act of creating sprites is a form of pixel art. It is sometimes referred to as spriting, especially in the hobbyist community.
The history of Sprite Sheet
Examples of Sprite Sheet