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Unit 9: I/O & Secondary Storage Structure

Webcam: A camera connected to a computer or server that allows anyone connected to the Internet Notes
to view still pictures or motion video of a user. The majority of webcam web sites are still pictures
that are frequently refreshed every few seconds, minutes, hours, or days. However, there are
some sites and personal pages that can supply streaming video for users with broadband.
Figure 9.8: Webcam

Digital camera: A type of camera that stores the pictures or video it takes in electronic format

instead of to film. There are several features that make digital cameras a popular choice when

compared to film cameras. First, the feature often enjoyed the most is the LCD display on the
digital camera. This display allows users to view photos or video after the picture or video has
been taken, which means if you take a picture and don’t like the results, you can delete it; or if
you do like the picture, you can easily show it to other people. Another nice feature with digital
cameras is the ability to take dozens, sometimes hundreds of different pictures.
Figure 9.9: Digital Camera

9.2.2 Output Device

Any peripheral that receives and/or displays output from a computer is known as output device.
Below are some examples of different types of output devices commonly found on a computer.
Prointer: A printer is a peripheral which produces a hard copy (permanent human-readable
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 or Ethernet), and can serve as a hardcopy device for any user on the
network. Individual printers are often designed to support both local and network connected
users at the same time.
Figure 9.10: Printer

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