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1 Terabyte (TB)              1024 GB
                                      1 Petabyte (PB)              1024 TB

                                      1 Exabyte (EB)               1024 PB
                                      1 Zettabyte (ZB)             1024 EB


                 Peripheral Device Ports

        These ports act as a connector or a point of attachment between the external peripheral devices like mouse,
        printer, keyboard, camera, scanner, etc. and the computer. There are different types of ports present in a computer
        system. Some of the commonly used are discussed below:
           • Serial Port: In Serial port data transmission between the computer and the peripheral device takes place in a
          sequence of one bit at a time.It was used to connect mouse and external modems in older times. Nowadays it
          is replaced by a USB port.

           • Parallel Port: In Parallel port data transmission between the computer and the peripheral device takes place in
          a parallel line of eight bits at a time. It is used to connect scanners and printers.

           • USB Port: Universal Serial Bus is a new technology port which supports the connection of a variety of devices
          like scanners, printers, keyboard, cameras,speakers, etc. to the computer. It is much faster than serial or parallel
          ports. Smartphones, Tablets, e-book readers use USB for charging.
           • Ethernet Port: Ethernet Port provides a network connection by connecting the Ethernet cables to the computer
          for network and Internet connectivity using wired technology.
           • HDMI Port: High Definition Media Interface port is used to connect high quality audio and video devices like
          MP3 players, cameras, smart phones, Tablets, Smart TV to computers. It helps in the transmission of good
          quality audio and video files.

                 Motherboard

        Motherboard or the main board consists of a board containing electric circuits that connects all the important
        components of the computer. If the CPU is the brain of the computer, then, the motherboard is the central nervous
        system making it the backbone or spine of a computer system. It consists of:



















                                                       Motherboard

           • Ports to connect different input and output devices.
           • Memory slots that contain the system’s main memory.
           • ROM-BIOS chip that acts as an interface between the operating system and the hardware of a computer.
           • System Clock that synchronises all the components of the motherboard.
           • Power connector that gives power supply to all the essential components on the motherboard.



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