Why does an audio CD player skip?

The player can be set to save some details of its configuration (known as a "definition file") on a per-DVD or per-file basis. These details can include audio levels, brightness and other color controls, aspect ratio, position on screen, blanking (to cover up unwanted parts of the image); and for DVDs it can also include the start point, so as, for example, to start the DVD at the main menu so as to skip introductory trailers.