Cat.6 Ethernet cable, also known as Category 6 cable, is a type of twisted pair cable used for Ethernet networking. It is designed to support higher data transfer rates than previous categories, such as Cat.5e. Here are some key features of Cat.6 cables:

1. Speed: Cat.6 cables can support data transfer rates of up to 10 Gbps (gigabits per second), although they are commonly used for 1 Gbps (gigabit) networks.

2. Wiring: These cables are made up of four twisted pairs of copper wire, which helps to reduce crosstalk and interference, improving signal quality.

3. Shielding: Cat.6 cables can be either unshielded (UTP) or shielded (FTP - Foiled Twisted Pair or SSTP - Shielded Screened Twisted Pair). Shielded versions provide better protection against electromagnetic interference (EMI) and are suitable for environments with high levels of interference.

4. Compatibility: Cat.6 cables are backward compatible with Cat.5, Cat.5e, and Cat.3 equipment, although the maximum speed will be limited by the capabilities of the older equipment.

5. Applications: They are used in various applications, including local area networks (LANs), data centers, and high-speed internet connections.

6. Length Limitations: The maximum length for a Cat.6 cable is typically around 100 meters (328 feet) to maintain the specified performance levels.

Cat.6 cables are an improvement over Cat.5e in terms of performance and are capable of supporting the demands of modern networking, including high-definition video streaming, VoIP, and other bandwidth-intensive applications.