Color toner cartridges are essential components used in laser printers to produce colored prints. They contain powdered ink, known as toner, which is fused onto paper using heat. Each cartridge typically corresponds to a specific color: cyan, magenta, yellow, and black (often referred to as CMYK). When printing, the printer combines these colors in varying amounts to create a wide spectrum of hues. Replacing toner cartridges is necessary when they run low or empty, ensuring high-quality prints. Proper disposal and recycling of used cartridges are also important for environmental sustainability.