Cat 6 is a type of Ethernet cable used for networking. It is capable of transmitting data at speeds up to 10 Gbps, which is twice as fast as Cat 5e. It is also backward compatible with Cat 5e and Cat 5 cables. Cat 6 cables are thicker than Cat 5e cables and have more stringent specifications for crosstalk and system noise. This makes them ideal for use in high-speed networks, such as those used in businesses and data centers. They are also more expensive than Cat 5e cables.