Definitions
Chapter 6
3-D printers –It refers to a type of appliance that allows the creation of a physical object from a three-dimensional digit model. It relates to computer-aided engineering device that enables the creation of three-dimensional objects.
Aspect ratio –this refers to the attribute that is used to determine the comparative horizontal and vertical sizes of computer graphics.
Bar code –refers to an optical and machine-readable representation of data. Consequently, the data describes something about the object that transmits the barcode.
Bluetooth – refers to a wireless skill that allows communication between Bluetooth compatible devices.
Contrast ratio –relates to a property of a display system which is the ration of the luminance of the brightest colour to the darkest shade that the system may be able to produce.
Dot pitch –refers to the degree of the distance between each adjoining pixel on a colour computer monitor usually expressed in millimetres.
Dots per inch (dpi) – refers to the measure of the sharpness that relates to illuminated points on a display screen.
Ergonomics – refers to the study of how humans interact with human-made objects.
High definition television (HDTV) –describes a television system providing an image resolution that is higher resolution than standard-definition.
Inkjet printer- refers to a type of computer printing that creates a digital image by rolling drops of ink into a paper, plastic or other substrates.
Input –This is whatever goes into the computer and ranges from the command one enters from the keyboard or another computer.
Laser printer –refers to a common type of personal computer printer that uses a non-impact key to produce good quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum.
Magnetic-ink character recognition (MICR) –refers to a technology used to verify the legitimacy or originality of paper documents, for example, checks. Besides, a special ink is used in the printing of certain characters on the original documents.
Mouse –refers to a handheld pointing device that detects two-dimensional motion relative to a surface.
Optical-character recognition (OCR) –refers to a kind of printer that uses a laser beam to identify the characters on a given sheet of a paper.
Output –This refers to processed data of a computer.
Plotter – refers to a computer printer for printing vector graphics.
Printer – relates to a machine that is used for printing text or pictures especially the one linked to a computer.
RFID reader –This is a type of device that helps gather information from an RFID tag and is used to track individual objects.
Stylus –refers to a small pen-shaped instrument that is used to input commands to a computer screen, graphics tablet and mobile device.
Touch screen –refers to a computer display screen that is also an input device. It is a device that allows the user to interact with the computer but touching areas on the screen.
Universal Product Code (UPC)- refers to a type of code printed on a retail product packaging to aid in recognising a particular item.
Virtual reality (VR) –refers to a collaborative computer-generated experience taking place within a stimulating environment.
Voice over IP (VoIP) – this is a technology that permits you to make voice calls using a wider internet connection instead of an analogue phone line.
Chapter 7
Cylinder -refers to any set of all tracks of equal diameter in a hard disk drive.
Hard disk -relates to a hardware device that is used to store data like files and software
Platter –it is the round disk on which magnetic data is stored in a hard disk drive.
Sector -refers to a subdivision of a track on a magnetic disk.
Track -refers to a data storage ring on a computer floppy diskette that is capable of storing information.
Redundant array of inexpensive disks (RAID) -refers to a data storage virtualisation skill that combines multiple disk drive elements into one or more logical units for data redundancy.
CD (compact disc) -relates to a small drive on which music or other digital information is stored in the form of the pattern and from which it can be read using a laser light reflected off the disc.
Land -this is the raised area in compact disk or DVD where data is stored.
Pit -refers to an indentation in an optical medium, for example, a CD-ROM or DVD.
Blu (ray disc (BD) – refers to an optical disc format that is used for recording of high definition video and storing large amounts of data
CD(R (CD (recordable) – refers to blank CDs that records data written by a CD burner.
CD (RW (compact disc rewritable) – refers to a blank CD that can be written to by a CD burner to multiple times. Again the data burned on it cannot be changed or erased.
DVD (digital versatile disc) – refers to a type of optical media that is used for storing data.
Nonvolatile storage -this is mostly used for the task of secondary storage or can be long term persistent storage.
Solid state storage – refers to a type of non-storage volatile computer storage that stores and retrieves digital information using electronic circuits.
USB drive -relates to a minor flash memory card that plugs into a computer USB port and functions as a portable hard drive.
Cloud computing – is a type of interment based computing where different services for instance servers storage and applications are delivered to organization computers and devices.
Cloud storage – refers to the model of the computer data storage in which the digital data is stored in logical pools.
Mass storage devices -Relates to the various techniques and devices for storing large quantities of data.
File server –is a computer attached to a network that provides a location for shared disk access, for example, shared storage of computer files.
RAID system -refers to a variety of hard drives linked and set up in ways to help protect or speed the performance of a computer disk storage.