Toner cartridges are essential components used in laser printers to produce high-quality printed documents. They contain a fine powder called toner, which is made from plastic particles, carbon, and coloring agents. When you print, the printer uses heat and pressure to transfer the toner onto paper, creating sharp text and images. These cartridges come in various types and sizes, depending on the printer model. Some printers use separate cartridges for different colors, like cyan, magenta, yellow, and black, while others use a single cartridge for all colors. Replacing toner cartridges is a routine maintenance task that ensures your printer continues to function effectively.