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Memory Stick
                             Memory stick is a portable memory card used as an add-on for smartphones, digital cameras,

              Memory Stick   SmartTV etc. its capacity varies from 4 GB to 128 GB.

                       Measuring Unit for Memory


              The unit used to measure data stored in memory or storage devices is the byte.   1 Byte      8 bits
              In computing, a byte for memory is equivalent to a kilometer for distance, a   1 Kilobyte (KB)  1024 Bytes
              second for time, or a kilogram for weight.
                                                                                         1 MegaByte (MB)  1024 KB
              Computers work in binary digits— 0 and 1 to form endless combinations of 8
              bits(1 Byte). This byte represents a single letter, number, punctuation, or any   1 GigaByte (GB)   1024 MB
              other special character on the keyboard. These bytes combine in different   1 TeraByte (TB)   1024 GB
              forms to represent data.                                                   1 PetaByte (PB)   1024 TB
                 • bit: A bit is the smallest measuring unit. It can be either 0(Off) or 1(On).
                 • Byte: A byte is the basic unit for measuring units. It is made up of 8 bits.  1 ExaByte (EB)   1024 PB
              To represent huge data we have different units to measure as listed below:  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 port 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.
                 • Power Port: It is used to connect the system to the power supply.

                       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:
                 • Ports to connect different input and output devices.                          Motherboard
                 • 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.

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