Chapter 1: Types and Components of Computer Systems

• Dialogue-based interface: No need for a driver to take their hands off the steering wheel. It's useful for people with disabilities. It can be used as security due to voice recognition to identify a person. It is unreliable when there is background noise. The user needs to know the commands. It is complex to set up.
• Gesture-based interface: No physical contact or training needed. It replaces mechanical input devices. Very natural interface for human operators. Only works closer to the camera/sensor. Accepts a limited number of movements. It picks up unintentional movement.
• A desktop refers to a general-purpose computer made up of a separate monitor, keyboard, mouse and processor unit. 
• Mobile computers are a group of computers that are more portable than desktop computers, such as tablets, phablets, smartphones, and laptop computers. 
• Laptop (notebook) refers to a computer with a monitor, keyboard, pointing device and processor in one single unit.
• Smartphones have an operating system that allows to run computer applications and make phone calls.
• Tablets work similarly to phones with a virtual keyboard.
• Phablets are referred to as hybrid smartphones between tablets and smartphones.
• Extended reality (XR) refers to real and virtual combined environments. Common examples include: Augmented reality, virtual reality, and mixed reality.
• Augmented reality: Virtual information and objects are overlaid onto real-world situations.
• Virtual reality: It can take the user out of the real world into a virtual-digital environment.