Toner is a powder that is used in laser printers and photocopiers to create an image on paper. Printers receive toner directly from cartridges. Toner for color printers come in Cyan, Yellow, Magenta, and Black. Toner cartridges can come in many different shapes and sizes, depending on the brand and model of the printer. For example, in order for a business to print an invoice for a customer, they will need toner for printer to produce the image.