They print in the same way as photocopiers. Powdered ink, called 'Toner', is fused onto paper by heat and pressure.

You can purchase a laser printer which prints black and white copies only or you can pick a colour laser printer. Black and white versions are relatively cheap to purchase and you only need to buy one toner (which is also expensive). Colour laser printers are still a little too expensive for most people to purchase for home use although many offices now have at least one colour laser printer. 

Advantages

• High quality printouts - better than ink-jet or dot-matrix
• Fast printouts - faster than ink-jet or dot-matrix
• Prints very quietly - quieter than ink-jet or dot-matrix
• Cost per page is low - cheaper than ink-jet or dot-matrix

Disadvantages

• Most expensive printer type to buy, especially colour lasers
• Toner is more expensive than ink-jet cartridges
• Expensive to repair - lots of complex equipment inside
• Fairly bulky - larger than ink-jet printers
• Can't use continuous or multi-part stationary to create carbon copies like you can with a dot-matrix printer