RJ45 is an integrated Ethernet port on PC motherboards. It connects to a local‑area network or broadband via network cables and realizes wired data transmission for computers. It can be linked with network devices such as switches and routers to provide stable and high‑speed wired‑network access.

USB (Universal Serial Bus) is one of the  common expansion ports on motherboards. It is used to connect a wide range of external peripherals, including mice, keyboards, USB flash drives, portable hard disks, printers, cameras, docking stations, serial debug cables and more. It supports data transfer, peripheral power supply, audio‑video output and other functions, meeting expansion requirements for daily office work, data storage and equipment debugging.