A ink catridge is a removable component on the printer.The catridge becomes empty when the ink in it was fully used.You can not do any printing work with the empty catridge.You have to replace the empty catridge with another new catridge or you have to refill it for the further use of it.You can also sell it for the comapanies which are remanufacturing the old catridges.A printer is in its best when the quality of the printed matters stands high.So you have to choose the best one for you. http://www.cheaprefills.info