A printing technology which uses very fine electro-magnetically charged particles (usually called toner). The particles are dispersed onto the paper and heated to a temperature that causes these particles to become embedded into the paper. This process is called fusing.

Toner use is growing rapidly, and color toner especially. A toner cartridge usually costs around $60 for monochrome (black), and upwards of $100 per color for the color laser toner cartridges (cyan, yellow, magenta, black).