A toner cartridge is a replaceable component of laser printers and copiers, containing toner powder—fine, dry particles of pigment and plastic. The cartridge is essential for producing high-quality prints, as the toner powder is fused onto paper using heat and pressure, creating sharp text and images. Each cartridge includes sections for toner storage, a developer unit, and often a drum that transfers toner to paper. Toner cartridges come in black and color varieties (cyan, magenta, yellow, black, or CMYK) for versatile printing needs. They are typically easy to install and are known for their efficiency, as they produce more pages compared to ink cartridges, making them popular in offices and businesses with high-volume printing demands.