Laser cartridges are essential components used in laser printers to produce high-quality printed documents. They contain a fine powder called toner, which is fused onto paper using heat and pressure. This process allows for sharp text and detailed images, making laser printers popular for both home and office use. Each laser cartridge is designed for specific printer models, ensuring compatibility and optimal performance. When the toner runs low, the cartridge must be replaced to maintain print quality. Some cartridges are refillable, while others are single-use, contributing to the overall cost of printing.