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Glossary 128
Glossary
You can find the terminologies in this User Guide listed in alphabetic order. For terminologies other than
these, find them in the Windows Help.
Backup
A way to save the current data, which can be restored later if necessary. Backup is a way to restore
computer data when the data or computer is damaged.
Client
This refers to a computer that uses a shared network resource provided by a server.
DDR SDRAM (Double Date Rate Synchronous Dymamic Random Access Memory)
DRAM is a memory type whose cells consist of a capacitor and transistor manufactured at a low
price.
SDRAM is a memory type whose performance is improved by synchronizing the clock with the ex-
ternal clock of the CPU.
DDR SDRAM is a memory type whose performance has been improved by doubling the operating
speed of the SDRAM and is widely used nowadays. This computer uses DDR SDRAM.
Device Manager
An administrative tool used to manage computer devices. You can add or remove hardware or up-
date a device driver using the Device Manager.
Direct X
An application interface that has been developed to enable Windows application programs to access
hardware devices at a very high speed. Since the operating speed of graphics, memory and sound
cards must be very fast to provide high quality video and sound for games, Direct X enables a faster
control and interaction between applications and hardware devices. By using Direct X, the multime-
dia performance of Windows has been hugely improved.
Driver
Software that interacts between the hardware and the operating system. An operating system man-
ages and controls the hardware information. In general, a driver is supplied with the corresponding
hardware device.
DVD (Digital Versatile Disk)
The DVD was developed to replace the CD (compact disk). Although the shape and size of a DVD
are the same as a CD, the capacity of a DVD is at least 4.7GB while the capacity of a CD is 600MB.
DVD video is digital unlike VHS video and supports MPEG2 compression and digital audio. To play a
DVD, a DVD drive is required.
Firewall
A security system that is used to protect an internal network or intranet from external networks
through an authentication procedure.