Cat 7 refers to Category 7 cabling, a type of twisted pair cable used for high-speed data transmission. It is designed to support frequencies of up to 600 MHz and can transmit data at speeds of 10 Gbps over distances of up to 100 meters. This makes it suitable for demanding applications like data centers and enterprise networks. The construction of Cat 7 cables includes shielding for each pair of wires, which helps reduce interference and crosstalk. This shielding allows Cat 7 to provide better performance compared to earlier categories, such as Cat 6 and Cat 5e, making it a popular choice for modern networking needs.