CAT/FOLD (Category/Folder) is a feature that allows you to select from various music categories. It is part of the entertainment system, in MP3 mode.
Now, technology has made cars to become a mobile computer packed with new entertainment options, Internet access and a dizzying range of apps that help drivers avoid traffic jams, find parking spots and locate the nearest coffee shop. But the National Highway Traffic Safety Administration, which oversees auto safety, recently issued voluntary guidelines for carmakers to limit the visual and mental distractions that new technology can create.
Of interest, Apple has been moving in the automotive industry at a clipped rate, having, for example, just recently launched iTunes Radio in-vehicle via an exclusive with Nissan. Find out more at SlashGear.