CPU: Central Processing Unit: The brain of the somputer; Processes all the data that passes through a computer.

Analog: continuous electrical signals that vary in time.

Digital: non-continuous signals that change in individual steps.

ESD Strap: a Band that straps to your rist and the other side to a grounded object; Grounds all static electricricity in your body.

BIOS: Basic Input/Output System: a boot firmware, designed to be the first code run by a PC when powered on.

Batery: A device that powers electrical appliances.

Binary Number Sytem: a numeral system that represents numeric values using two symbols, 0 and 1.

Bit: a binary digit, taking a value of either 0 or 1.

Byte: a basic unit of measurement of information storage in computer science.

CMOS: Complementary metal–oxide–semiconductor: a major class of integrated circuits.

Chip: a pulse of a direct-sequence spread spectrum (DSSS) code, such as a pseudo-noise code sequence used in direct-sequence code division multiple access (CDMA) channel access techniques.

Device Bay: a simple way to add, remove, and share hardware devices.

ESD: electrostatic sensitive device : Any component (primarily electrical) which can be damaged by common static charges which build up on people, tools, and other non-conductors or semiconductors.

Expansion Card Slot: a printed circuit board that can be inserted into an expansion slot of a computer motherboard to add additional functionality to a computer system.

Hard Drive: Device used to store computer data.

Hexidecimal Number System: a numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F (or a through f) to represent values ten to fifteen.

Motherboard: the central printed circuit board (PCB) in some complex electronic systems, such as modern personal computers.

HotSwap: a term used to separately describe the functions of replacing system components without shutting down the system.

RAM: DIMM, SIMM: Different types of data storage. Data is stored randomly.

Parallel: a form of computation in which many calculations are carried out simultaneously,[1] operating on the principle that large problems can often be divided into smaller ones, which are then solved concurrently ("in parallel").

DE Cables: a standard electronic interface used between a computer motherboard's data paths or bus and the computer's disk storage devices.

Cooling Fans: Fans used too cool down internal PC components to prevent overheating.

Power On Self Test: The first step to the process of booting a computer.

PCI: a computer bus for attaching hardware devices in a computer.