RJ-45 is the common name for the 8-pin connector (8P8C) used for various Ethernet cables (CAT5, CAT5e, CAT6, etc), which come with twisted pairs for cross-talk (interference) resistance.
Ethernet is a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 1983 as IEEE 802.3, and has since been refined to support higher bit rates and longer link distances. Over time, Ethernet has largely replaced competing wired LAN technologies such as Token Ring, FDDI and ARCNET.
The original 10BASE5 Ethernet uses coaxial …