A network cable is used to connect a computer to a network. This can be a range of setups such as a broadband router feeding a single computer, two computers connected directly to each other, or a multiple number of computers and a network printer all connected to a server or router. RJ45 is the plug type. The general difference between CAT5e and CAT6 cabling is the increased transmission performance with CAT6. Note that there are two configurations of cables, Straight and X-Over (crossover). A X-Over cable is only used when connecting two computers directly to each other, or when connecting a computer directly to a peripheral for setup/configuration purposes.