|  | 6.4 | Framing
| 6.4.3 | Three analogies for frames
Following are three analogies that can help explain frames. Picture Frame Analogy A picture frame marks the outside of a painting or photograph. It makes the painting or photograph easier to transport and protects the painting or photograph from physical damage. In computer communication, the picture frame is like the frame, while the painting or photograph is like the data. The frame marks the beginning and end of a piece of data, and makes the data easier to transport. The frame helps protect the data from errors. Packaging/Shipping Analogy When you ship a large, heavy package, you usually include various layers of packing material. The last step, before you put it on a truck to be shipped, is to place it on a pallet and wrap it. You can relate this to computer communications by thinking of the securely packed object as the data, and the whole, wrapped package on the pallet as the frame. Movies/Television Analogy Movies and TV work by flashing a series of frames, or still pictures, at a rate of 25 frames per second for movies, and 30 frames per second for television. Because of the rapid movement of each frame, your eyes see continuous motion instead of the individual frames. These frames carry visual information in chunks, but all of them together create the moving image.