Most people today have personal printers in their homes and offices that they use for work, school, and even entertainment such as printing family photos or printing out articles they prefer not to read on a screen.  However, not many really know how printers work and what types of printers there are to choose from.  The most commonly used and affordable printer type is what is termed an inkjet printer. Just as the name suggests, these printers use small bursts of black and colored ink to create the images and words on the sheet. So, what is an inkjet cartridge and why is it important to know?