hi shilpa,
In printer you can find three types . 1) Dot Matrix 2)Inkjet 3)Laser
all the three are used for both office and home use depending upon your necessity. They differ in the catridge used and the technology used.
For office purpose mostly laser or Dot matrix is used as they are durable and give more prints compare to inkjet..
For color prints however dot matrix can not be used..
Hope you can a brief idea on printers types..
Regards