What are Printers?
Printers are peripheral devices used to produce hard copy of computer output, normally data, text and in certain cases, graphics; that is such as drawings or charts. Printers vary in their capabilities as far as text enhancements such as underlining or emboldening are concerned and also in their ability to print graphics.


There are two types of Printers:
  • Impact
  • Non-Impact
Impact PrintersWhat is an Impact Printer?

  1. Computer printer that creates characters by striking an inked or carbon ribbon against the paper beneath.
  2. Refers to a class of printers that work by banging a head or needle against an ink ribbon to make a mark on the paper.
Examples of Impact Printers
  • Dot-matrix printers
  • Daisy-wheel printers
  • Line printers
Features of an Impact Printer
  • Impact Printers tend to be considerably noisy
  • They create the characters by striking the paper.
  • They print on most types of paper.
  • Multiple (carbon) copies may be printed at once
  • They are relatively slow.
  • They do not print transparencies (documents printed on clear plastic film for use with over head projector.
Non-Impact PrintersWhat is a Non-Impact Printer?
A non-impact printer is one formed without the print head coming into direct physical contact with the paper however they
work by spraying ionized ink or toner powder at a sheet of paper.

Examples of Non-Impact Printers
  • Laser printers
  • Inkjet printers
  • Solid Ink printers
  • Dye Sublimation printers
  • Thermal printer
  • Bubble Jet printer
Features of Non-Impact Printers
  • The printer head does not make contact with the paper.
  • Higher speed in characters per second is possible.
  • They print on most types of paper but better quality is obtained with better paper.
  • Transparencies are usually supported.
  • Better print quality than Impact printers
  • Use either solid or liquid cartridge-based ink.
  • Non-impact printers typically require little maintenance beyond replacing the print or toner cartridges.