What does CAT1 mean?

CAT1 meaning in Computer Science Dictionary

CAT1 or Category 1 was introduced in 1985 and is wiring used to transfer sound information used in phone solutions. This wiring was available in unshielded twisted sets and untwisted. Although Cat1 may nevertheless be found with older houses, most contemporary houses and company tend to be replacing CAT1 for CAT3 and CAT5.