A Continuous Ink Supply System (CISS) is a printing technology designed to provide a constant supply of ink to printers. It consists of large external ink tanks connected to the printer's ink cartridges through tubes. This setup allows for a more efficient ink usage, reducing the frequency of cartridge replacements and lowering printing costs. CISS is particularly popular among users of inkjet printers who require high-volume printing. By using larger ink reservoirs, CISS can significantly extend the time between refills compared to traditional cartridges. This system is beneficial for both home and business environments where printing demands are high.