These refer to the open contacts on the motherboard that can be used to configure different settings of the board. With time, the number of jumpers has come down, with most of its functionality shifted to the CMOS / BIOS. Still, many motherboards today do have one set of jumpers, which is used to reset the BIOS settings. RJ-45, or the LAN port, allows the PC to be connected to a network, whether to a LAN or to the Internet via a broadband modem. The DB 25 or Parallel port is the traditional port for older printers. These are rarely seen today.
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