Computer
A computer is a programmable machine designed to sequentially and
automatically carry out a sequence of arithmetic or logical operations. The
particular sequence of operations can be changed readily, allowing the
computer to solve more than one kind of problem.
Conventionally a computer consists of some form of memory for data
storage, at least one element that carries out arithmetic and logic operations,
and a sequencing and control element that can change the order of operations
based on the information that is stored. Peripheral devices allow information
to be entered from an external source, and allow the results of operations to
be sent out.
A computer's processing unit executes series of
instructions that make it read, manipulate and
then store data. Conditional instructions change
the sequence of instructions as a function of the
current state of the machine or its environment.
The first electronic computers were developed
in the mid-20th century (1940–1945).
Originally, they were the size of a large room,
consuming as much power as several hundred
modern personal computers (PCs).
Modern computers based on integrated circuits are millions to billions of
times more capable than the early machines, and occupy a fraction of the
space. Simple computers are small enough to fit into mobile devices, and
mobile computers can be powered by small batteries. Personal computers in
their various forms are icons of the Information Age and are what most
people think of as "computers". However, the embedded computers found in
many devices from mp3 players to fighter aircraft and from toys to industrial
robots are the most numerous. http://en.wikipedia.org/wiki/Computer
Scanner
A scanner is a device that captures images from photographic prints, posters,
magazine pages, and similar sources for computer editing and display. Scanners
come in hand-held, feed-in, and flatbed types and for scanning black-and-white
only, or color. Very high resolution scanners are used for scanning for
high-resolution printing, but lower resolution scanners are adequate for capturing
images for computer display. Scanners usually come with software, such as
Adobe's Photoshop product, that lets you resize and otherwise modify a captured
image.
http://whatis.techtarget.com/definition/0,,sid9_gci212942,00.html
Fax
A
fax (short for facsimile) is a document sent over a telephone line. Fax machines
have existed, in various forms, since the 19th century, though the modern fax machine
became easible only in the mid-1970s as the sophistication of technology increased and
cost of the three underlying technologies dropped. Digital fax machines first became
popular in Japan, where they had a clear advantage over competing technologies like
the teleprinte since at the time (before the development of easy-to-use input method
editors) it was faster to handwrite kanji than to type the characters. Over time, faxing
gradually became affordable, and by the mid-1980s, fax machines were very popular
around the world.
http://en.wikipedia.org/wiki/Fax
Printers
In computing, a printer is a peripheral which produces a text and/or
graphics of documents stored in electronic form, usually on physical
print media such as paper or transparencies. Many printers are
primarily used as local peripherals, and are attached by a printer
cable or, in most newer printers, a USB cable to a computer which
serves as a document source. Some printers, commonly known as
network printers, have built-in network interfaces, typically wireless
and/or Ethernet based, and can serve as a hard copy device for any
user on the network. Individual printers are often designed to support
both local and network connected users at the same time. In addition,
a few modern printers can directly interface to electronic media such
as memory cards, or to image capture devices such as digital
cameras, scanners; some printers are combined with a scanners
and/or fax machines in a single unit, and can function as
photocopiers. Printers that include non-printing features are
sometimes called multifunction printers (MFP), multi-function
devices (MFD), or all-in-one (AIO) printers. Most MFPs include
printing, scanning, and copying among their many features.
http://en.wikipedia.org/wiki/Printer_(computing)
Videos
VCD stands for 'Video Compact Disc' and basically it is a CD that contains
moving pictures and sound. If you're familiar with regular audio/music CDs,
then you will know what a VCD looks like. A VCD has the capacity to hold
up to 74/80 minutes on 650MB/700MB CDs respectively of full-motion
video along with quality stereo sound. VCDs use a compression standard
called MPEG to store the video and audio. A VCD can be played on almost
all standalone DVD Players and of course on all computers with a DVDROM or CD-ROM drive with the help of a software based decoder / player. It
is also possible to use menus and chapters, similiar to DVDs, on a VCD and
also simple photo album/slide shows with background audio. The quality of a
very good VCD is about the same as a VHS tape based movie but VCD is
usually a bit more blurry. If you want better quality checkout SVCD,CVD or
DVD
http://www.videohelp.com/vcd
Computer
http://en.wikipedia.org/wiki/Computer
Scanner
http://whatis.techtarget.com/definition/0,,sid9
_gci212942,00.html
Fax
http://en.wikipedia.org/wiki/Fax
Video
http://www.videohelp.com/vcd