1. Laptop
It is a portable computer that can be taken from one place to another at any time very easily. It is known as notebook computer, notepad or mobile computer. The laptop computer is small that incorporates all the features of a typical desktop computer. A Laptop combines the features of a desktop computer including display screen, speaker, keyboard, and pointing device such as touchpad into a single device. These computers are provided with a rechargeable battery that removes the need for continuous external power supply. However, these computers systems are more expensive than desktop computers. The different manufacturers of laptop computers are Acer, Apple, Panasonic, Sony and HP.
2. Notebook
It is an extremely lightweight personal computer. Notebook computers come with battery packs that enable you to run them without plugging them in. However, the batteries need to be recharged every few hours. It doesn't contain a CD/DVD drive due to small size. Notebook computers use a variety of techniques, known as flat panel technologies, to produce a light weight and non-bulky display screen. It can be used in libraries, class, office, meetings, airplane, bus. Most notebook computers have Wi-Fi and Bluetooth connections.
3. Personal Digital Assistant
It is also known as personal digital assistant, converged device, palmtop or mobile device. The hand-held computer is a very small size computer that can be kept in a pocket. It generally has a very small display screen, and the input devices for these computers are pen or an electronic styles. The storage capacity of the hand held computer is not very large. They generally use small cards to store data and programs instead of disk drives. Therefore, they are less powerful as compared to the desktop and laptop computers. The different examples of hand held computers are Apple Net won, Casio Cassiopeia, Franklin EbookMan, etc.
4. Tablet PC
Tablet Computers are ultraportable computers that are even smaller than traditional laptops. Their low cost means they're cheaper than almost any brand-new laptop. Recent improvements to tablet computers have allowed users to view HD video, get high quality sound, great photo capabilities, and the ability to share information, photos, and videos with anyone, It is a wireless, portable personal computer with a touch screen interface. It is a mobile computer. It allows the user to view the display screen in portrait or landscape.
i)Non-portable computer:
Personal computer
It is also known as Desktop computer. The personal computer systems are designed to be used by an individual at a single location. The typical components of a personal computer are keyboard, mouse, monitor, hard disk storage, peripheral devices and a system unit.
Work station Computer
Workstations are expensive, powerful machines used by engineers, scientist and other professionals who process lots of data. A person who needs to run complex programs and display both work in progress and result graphically, also used workstations. They have sophisticated display screen with high resolution graphics and operating system such as Unix. It requires a faster microprocessor, a large amount of RAM. Some examples: Sun Apollo, Hewlett Packard, IBM etc. Mobile computing is a form of human computer interaction by which a computer is expected to be transported during normal usage. Mobile computing has three aspects: mobile communication, mobile hardware, and mobile software. The first aspect addresses communication issues in infrastructure networks as well as communication properties, protocols, data formats and concrete technologies.
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