An RJ45 connector is a modular 8 position,8pin connector used for terminating Cat5e or Cat6 twisted pair cable. RJ45 is a type of communication protocol that is used for Ethernet and other long distance communications. In this type of communication, Data is transmitted between two electronics devices like Microcontrollers or Microprocessors over a very long distance without getting it lost. Normally communication protocols like SPI, USART, IIC will be used to transfer these data. These two devices are linked using a cable like CAT cables. The CAT cables are connected to the circuit through this RJ45 Connector. These connectors support any type of Ethernet cable like USP, CAT5e, CAT6 etc..