The document discusses different types of commonly used printers, including impact printers like dot matrix printers and non-impact printers like inkjet and laser printers. It describes how each type of printer works, for example that inkjet printers spray ink onto paper while laser printers use toner and heat to print high quality documents. The document also covers special purpose printers used in print shops that can print on various surfaces and produce professional quality output.

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2. Chapter 4B Printing

5. Dot Matrix Print Head

7. Dots Per Inch

16. Chapter 4B End of Chapter