1. Printer
1.1. Ink-jets Printers
1.1.1. Color or black and white
1.1.2. Printers with a higher dpi (dots per inch)
1.2. Photo Printers
1.2.1. Produce color photo-lab-quality pictures
1.2.2. Most use ink-jet technology
1.2.3. Print photos directly from a digital camera
1.2.4. Print from a memory card and preview photo on a built-in LCD screen
1.3. Laser Printers
1.3.1. High-speed
1.3.2. Black-and-White
1.3.3. High-quality
1.3.4. Color
1.4. Thermal Printers
1.4.1. Thermal wax-transfer printer
1.4.2. Dye-sublimation printer
1.5. Mobile Printers
1.5.1. Small
1.5.2. Lightweight
1.5.3. Battery-powered that allows a mobile user to print from a mobile device
1.6. Label and postage Printers
1.6.1. Small printer that prints on adhesive-type material
1.6.2. Can be printed on other types of printers
1.7. Plotters
1.7.1. used to produce high‐quality drawings
1.8. Large-format Printers
1.8.1. create photo‐realistic quality color prints on a larger scale
1.9. Impact printers
1.9.1. Dot-matrix printer
1.9.2. Line printer
2. Display devices
2.1. Monitor
2.1.1. LCD (Liquid crystal display)
2.1.1.1. DVI Port
2.1.1.2. HDMI Port
2.1.1.3. Display Port
2.1.2. Plasma
2.1.2.1. DTV(Digital Television)
2.1.2.2. HDTV
2.1.3. CRT Monitor
3. Speakers,headphones and earbubs
3.1. Headphones are speakers that cover your head or are placed outside of the ear
3.2. Earbuds (also called earphones) rest inside the ear canal
3.3. Some speakers are specifically designed to play audio from a portable media player
4. Data Projectors
4.1. takes the text and images displaying on a screen and projects them on a larger screen
4.1.1. Digital light processing (DLP) projector