An ink cartridge is a small container filled with liquid ink that is used in printers to produce text and images on paper. When you print a document, the printer uses the ink from the cartridge to create the desired output. There are different types of ink cartridges, including those for inkjet printers and laser printers, each designed to work with specific printer models. Replacing an ink cartridge is a common task for anyone who owns a printer. When the ink runs low, you can purchase a new cartridge that matches your printer's specifications. Some people choose to refill their cartridges to save money, while others prefer to buy new ones for better quality.