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3. A PRESENTATION BY: VIRAT SINGH 7-C

4. FLASH DRIVE IT IS A SMALL, LIGHTWEIGHT, REMOVABLE AND REWRITABLE FLASH MEMORY DATA STORAGE DEVICE. USB FLASH DISK IS FASTER, HOLDS MORE DATA AND MORE RELIABLE THAN A FLOPPY DISK. IT IS ALSO KNOWN AS PEN DRIVE, THUMB DRIVE OR SIMPLY USB DRIVE.

5. DVD DVD STANDS FOR DIGITAL VERSATILE DISK OR DIGITAL VIDEO DISK. ITS AN OPTICAL DEVICE THAT CAN BE USED FOR DATA STORAGE AND RECORD MOVIES WITH HIGH VIDEO AND SOUND QUALITY. THE STORAGE CAPACITY OF A DVD VARIES FROM 4.1 GB TO 17 GB.

6. COMPACT DISK A Compact Disc (also known as a CD) is an optical disc used to store digital data. It was originally developed to store sound recordings exclusively, but later it also allowed the preservation of other types of data. Audio CDs have been commercially available since October 1982. In 2010, they remain the standard physical storage medium for audio.

7. HARD DISK DRIVE IT IS AN ELECTRONIC DEVICE THAT CAN READ OR WRITE INFORMATION ON ITS METAL OR GLASS RECORDING SURFACE. THESE DISK DRIVES ARE VERY FAST AND HAVE LARGE STORAGE CAPACITY.

8. FLOPPY DISK IT IS ALSO CALLED AUXILIARY MEMORY WHERE DATA CAN BE STORED PERMANENTLY FOR FUTURE USE. THE TYPES OF EXTERNAL MEMORIES ARE FLOPPY DISK, HARD DISK, COMPACT DISK, FLASH DRIVE ETC.

9. RAM RAM [RANDOM ACCESS MEMORY] IS AN IMPORTANT COMPONENT OF MEMORY UNIT. WHATEVER INFORMATION WE ENTER INTO THE COMPUTER THAT EXISTS IN RAM. IT REMAINS THERE TILL WE ARE WORKING IN AN APPLICATION OR COMPUTER GETS ITS POWER SUPPLY. IT IS A VOLATILE MEMORY. DATA AND INSTRUCTIONS ARE TEMPORARILY STORED IN THE RAM. DURING PROCESSING, IF THE COMPUTER IS SWITCHED OFF DATA IS LOST FOREVER.

10. ROM ROM STANDS FOR READ ONLY MEMORY. IT IS SO CALLED, AS USER CAN ONLY READ FROM IT AND CANNOT WRITE INTO IT. THE PRIMARY USE OF ROM IS DURING THE BOOTING PROCEDURE, WHICH IS AN INITIAL PROGRAM TO START UP THE COMPUTER, WHEN POWER IS SWITCHED ON.

11. KEYBOARD As the name implies, a keyboard is basically a board of keys. The keyboard's design comes from the original typewriter keyboards, which arranged letters and numbers in a way that prevented the type-bars from getting jammed when typing quickly. This keyboard layout is known as the QWERTY design, which gets its name from the first six letters across in the upper-left-hand corner of the keyboard.

12. SPEAKERS Speakers are one of the most common output devices used with computer systems. Some speakers are designed to work specifically with computers, while others can be hooked up to any type of sound system. Regardless of their design, the purpose of speakers is to produce audio output that can be heard by the listener.

13. MOUSE In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. (Although traditionally a button is typically round or square, modern mice have spring-loaded regions of their top surface that operate switches when pressed down lightly.) It sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations, or extra buttons or features that can add more control or dimensional input. The mouse's motion typically translates into the motion of a cursor on a display, which allows for fine control of a graphical user interface.

14. MONITOR The computer monitor is an output device that is part of your computer's display system. A cable connects the monitor to a video adapter (video card) that is installed in an expansion slot on your computer’s motherboard. This system converts signals into text and pictures and displays them on a TV-like screen (the monitor).

15. MOTHERBOARD The motherboard is the main circuit board of your computer and is also known as the mainboard or logic board. If you ever open your computer, the biggest piece of silicon you see is the motherboard. Attached to the motherboard, you'll find the CPU, ROM, memory RAM expansion slots, PCI slots, and USB ports. It also includes controllers for devices like the hard drive, DVD drive, keyboard, and mouse. Basically, the motherboard is what makes everything in your computer work together.