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What is Photoconductor Unit for Color Laser Printer?

Can anyone help me out what is Lexmark C52034X Laser Toner Photoconductor for? What is the purpose of Photoconductor Unit?

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1. A photoconductor is a material that conducts electricity only when exposed to light. Photocopiers and laser printers have a large roller coated with photoconductive material. As this drum turns it is electrically charged by a high voltage corona wire. The next step is to reflect an image using a laser beam or reflected light from mirrors onto the drum as it turns neutralizing the charge where light hits leaving a latent image or static charge in the shape of the image you want to copy. The next step is to turn the roller past a brush made of toner (colored plastic particles). The static charge will pull the particles onto the charged area of the drum forming an image you can see, next feed a piece of paper onto this turning drum, as you do apply an opposite charge using a second high voltage wire (transfer corona) to the back side of the paper, causing the paper to stick to the toner/drum (opposite charges attract). Separate the paper from the drum using a high voltage alternating current (separation corona wire). Melt the toner into the paper with hot rollers. This will create a black and white image. For a full color image use colored filters and colored toner and repeat the process 3 times.