A. Hard Drive

MOTHER BOARD
Universal Serial Bus (USB) - a serial bus standard to interface devices. A major component in the legacy-free PC, USB was designed to allow peripherals to be connected using a single standardized interface socket, to improve plug-and-play capabilities by allowing devices to be connected and disconnected without rebooting the computer (hot swapping). Other convenient features include powering low-consumption devices without the need for an external power supply and allowing some devices to be used without requiring individual device drivers to be installed.
Parallel Port - a type of socket found on personal computers for interfacing with various peripherals. It is also known as a printer port or Centronics port. The IEEE 1284 standard defines the bi-directional version of the port.
CPU socket (or CPU slot) - widely used to describe the connector linking the motherboard to the CPU(s) in certain types of desktop and server computers, particularly those compatible with the Intel x86 architecture.
Accelerated Graphics Port (also called Advanced Graphics Port, often shortened to AGP) - a high-speed point-to-point channel for attaching a graphics card to a computer's motherboard, primarily to assist in the acceleration of 3D computer graphics. AGP is often referred to as a 'bus'; however, this is a misnomer - a single AGP controller is only capable of controlling a single device. This is the main reason that almost all mainboards have only a single AGP slot, although motherboards have been built with multiple independent AGP slots. AGP is currently being phased out in favor of PCI Express.
Peripheral Component Interconnect, or PCI Standard (in practice almost always shortened to PCI), specifies a computer bus for attaching peripheral devices to a computer motherboard. These devices can take any one of the following forms:
Complementary metal–oxide–semiconductor (CMOS) - a major class of integrated circuits. CMOS technology is used in chips such as microprocessors, microcontrollers, static RAM, and other digital logic circuits. CMOS technology is also used for a wide variety of analog circuits such as image sensors, data converters, and highly integrated transceivers for many types of communication.
IDE Controller - is primarily used to refer to devices for connecting SCSI, Fibre Channel and eSATA devices, but devices for connecting to IDE, ESCON, Ethernet, FireWire, USB and other systems may also be called host adapters. Recently, the advent of iSCSI has brought about Ethernet HBAs, some including TCP Offload Engines.
Memory Slot – use to store or install the Random access memory (RAM), a type of data storage used in computers. It takes the form of integrated circuits that allow the stored data to be accessed in any order — that is, at random and without the physical movement of the storage medium or a physical reading head.
Floppy Disk Controller (FDC) is a special-purpose chip and associated circuitry that directs and controls reading from and writing to a computer's floppy disk drive (FDD). This article contains concepts common to FDCs based on the NEC µPD765 and Intel 82072A and their descendants, as used in the IBM PC and compatibles from the 1980s and 1990s. The concepts may or may not be applicable to, or illustrative of, other controllers or architectures.
Computer Fan Plug-in – a slot used to connect the computer fan. Computer Fan can be any fan inside a computer case used for cooling purposes, and may refer to fans that draw cooler air into the case from the outside, expel warm air from inside, or move air across a heatsink to cool a particular component. The use of fans and/or other hardware to cool a computer is sometimes referred to as active cooling.
Power Supply Plug-in – is a slot where the source of power is plugged. Power Supply(sometimes known as a power supply unit or PSU) is a device or system that supplies electrical or other types of energy to an output load or group of loads. The term is most commonly applied to electrical energy supplies, less often to mechanical ones, and rarely to others.
C. System Unit

SIMMS – Single Inline memory Modules. SIMMs are electronic modules about 10-1/2 centimeters long that sit in slots, usually located on the main system board.
Video Adapter – also called Video Card. This is the interface card installed in the computer that controls and produces video on the monitor.
Motherboard – the main electronic circuit in a PC.
Power Supply - a case that holds a transformer, voltage control, and (usually) a cooling fan
Sound Board – also called Sound Card. Ttranslates signals from the system board into analog voltage levels, and has terminals to plug in speakers.
CD-Rom Drive - the most common type of removable media, cheap but fragile.

D. KEYBOARD
Typewriter Keys - A typewriter is a mechanical, electromechanical, or electronic device with a set of "keys" that, when pressed, cause characters to be printed on a document, usually paper.
The Windows key or Windows logo key (in short WinKey, or rarely Flag key or Menu Key) is a keyboard key originally introduced for the Windows 95 operating system. On keyboards lacking a Windows key, Ctrl+Esc can instead be pressed.
A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Print screen/sysrq - Usually located at the upper right hand corner of your keyboard next to the Scroll Lock and Pause/Break keys. Often abbreviated PrtScr, the Print Screen key is a useful key supported on most PCs.
Arrow keys are buttons on a computer keyboard that move the cursor in a specified direction. They are typically located at the bottom of the keyboard to the side of the numeric keypad, usually arranged in an inverted-T layout but also found in diamond shapes.
Numeric keypad, or numpad for short, is the small, palm-sized, seventeen key section of a computer keyboard, usually on the very far right. The numeric keypad features digits 0 to 9, addition (+), subtraction (-), multiplication (*) and division (/) symbols, a decimal point (.) and Num Lock and Enter keys.
The Enter key (or the return key) in most cases causes a form or dialog box to operate its default function, which is typically to finish an "entry" and begin the obviously desired process.
Num Lock - If you want to use the numeric keypad on the right end of the keyboard to display numbers, the Num Lock key must be selected (usually a light above the Num Lock will indicate that it is on). If you want to use the keypad to navigate within a document, turn off Num Lock by pressing the key (the light will go off).
Caps Lock - Locks the keyboard in "Capitals" mode (only applies to Alpha keys). The Caps Lock key should be used with caution. Using ALL CAPS is a usability no-no as many have difficulty scanning text that is ALL CAPS. Also, when sending email in all caps, this could be misconstrued as shouting at someone.
The Scroll Lock key is a remnant from the original IBM PC keyboard. In the original design, Scroll Lock was intended to modify the behavior of the arrow keys. When the scroll lock mode was on, the arrow keys would scroll the contents of a text window instead of moving the cursor.

E. Printer
Paper Roll - Pieces of paper used for printing.
Roll Cover – Cover use to protect the paper inside.
Power Pack – From electrical plug
Spindle - A pin or rod holding a bobbin or spool on which thread is wound on an automated spinning machine.
Ribbon Cartridge - A case containing a ribbon in a spool, for use in printers and electric typewriters.
Ribbon Cover – Protects the cartridge inside.
Power Switch – turn the printer on/off.
Power Light – Power indicator.
Low Paper Indicator – serve as a sign if the printer is out of paper or low in paper.