Cat 6 is the sixth generation of twisted pair Ethernet cabling that is used in home and business networks. Cat 6 cabling is backward compatible use for networking, cctv camera cabling, intercommunication and so on.
CAT6 is a bigger cable with a chunkier sheath. It reduces crosstalk because it has tighter wound wire pairs. More bandwidth means a greater ability of the cable to use an extensive range of frequencies. In a nutshell, CAT6 is of better quality, because it provides more 'physical space' to fit data.