N

Network Card: Network Cards are adapter cards in computers that enable the computers to connect to a network.  

NiCad: Nickel Cadmium (NiCad) is the most popular and durable type of rechargeable battery. They are quick to charge, last approximately 700 charge and discharge cycles, and work well in extreme temperature conditions. Unfortunately, NiCad batteries suffer from "memory effect" if they are not completely discharged each cycle. The memory effect reduces the overall capacity and run time of the battery.

NiCam (Nickel Cadmium): A type of laptop battery technology.  

NiMH (Nickel Metal Hydride): A type of laptop battery technology.

NiMH: Nickel Metal Hydride (NiMH) batteries do not suffer from the memory effect as the NiCad counterpart. Compared to a NiCad battery of equal size, NiMH batteries run for 30% longer on each charge cycle. They are also made from non toxic metals so they are environmentally friendly. They downside of NiMH technology is the overall battery life. These batteries generally last for 400 charge and discharge cycles.

O

Operating System: The main software that is in use on a computer system. The operating system is responsible for booting up the computer and making all its resources available to the user and other software packages in a user friendly environment.