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trackballs
The trackball or tracking ball is the stationary pointer device, composed of a ball embedded in a receptacle containing sensors that detect the rotation of the ball in two axes (like a mechanical computer mouse, face up, with the ball sticking out on top).
Some fit the side of the keyboard, and have built-in buttons with the same functions as mouse buttons.
The user rotates the ball with the thumb, fingers, or the palm of the hand to move the cursor.

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Input divice
A common computer input device, a
keyboard. A user presses a key which transfers information to a computer.
In computing, an input device is a piece of computer hardware equipment used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks. Audio input devices may be used for purposes including speech recognition. Many companies are utilizing speech recognition to help assist users to use their device(s).
Input devices can be categorized based on:

modality of input (e.g. mechanical motion, audio, visual, etc.)
whether the input is discrete (e.g. pressing of key) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous)
the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CADapplications)

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Embedded Systems
An embedded system1 or embedded (embedded, embedded) is a computer system designed to perform one or a few dedicated functions, 2 3 often in a real-time computer system. Contrary to what happens with general-purpose computers that are designed to cover a wide range of needs, embedded systems are designed to adapt to specific needs. In an embedded system most of the components are included in the motherboard (video card, audio, modem, etc.) and often the devices do not have the appearance of what is usually associated with a computer. Some examples of embedded systems can be devices such as a taximeter, an access control system, the electronics that control a vending machine or the control system of a photocopier among other multiple applications.

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Smart Phones
It is a type of pocket computer that combines the elements of a tablet with those of a cell phone. On a mobile computing platform, with greater capacity to store data and perform activities, similar to that of a minicomputer, and with greater connectivity than a conventional mobile phone. The term intelligent, which is used for commercial purposes, refers to the ability to be used as a pocket computer, and even replaces a personal computer in some cases.

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Netbooks

Netbook is a generic name given to a category of small, lightweight, legacy-free, and inexpensive laptop computers that were introduced in 2007. Netbooks compete in the same market segment as mobiles and Chromebooks (a variation on the portable network computer).

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Laptop Computers
laptop, also called a notebook computer or just notebook, is a small, portable personal computer with a "clamshell" form factor, having, typically, a thin LCD or LED computer screen mounted on the inside of the upper lid of the "clamshell" and an alphanumeric keyboard on the inside of the lower lid. The "clamshell" is opened up to use the computer. Laptops are folded shut for transportation, and thus are suitable for mobile use.[1] Its name comes from "lap", as it was deemed to be placed for use on a person's lap. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, as of 2014, there is often no longer any difference.[2] Laptops are commonly used in a variety of settings, such as at work, in education, in playing games, Internet surfing, for personal multimedia and general home computer use.

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Desktop Computers
A desktop computer is a personal computer designed for regular use at a single location on or near a desk or table due to its size and power requirements. The most common configuration has a case that houses the power supply, motherboard (a printed circuit board with a microprocessor as the central processing unit (CPU), memory, bus, and other electronic components), disk storage(usually one or more hard disk drives, optical disc drives, and in early models a floppy disk drive); a keyboard and mouse for input; and a computer monitor, speakers, and, often, a printer for output. The case may be oriented horizontally or vertically and placed either underneath, beside, or on top of a desk.

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Mainframes
The capacity of a central computer is defined both by the speed of its CPU as by its large internal memory, its high and large external storage capacity, its results in fast and considerable I / O devices, the high quality of its internal engineering which results in high reliability and expensive technical support, but high quality. A central computer can run for years without problems or interruptions and repairs can be made while it is running. Central computer vendors offer special services; for example, if the computer is broken, the vendor will run your client's applications on their own computers without users noticing it while repairs last. The internal independence of these computers is so great that, at least, in a known case, the technicians could change the site's central computers by disassembling them piece by piece and assembling them in another place, leaving, meanwhile, said computers running; In this example, the change of the central computers from one site to another occurred in a transparent manner.

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Supercomputers
Supercomputers play an important role in the field of computational science, and are used for a wide range of computationally intensive tasks in various fields, including quantum mechanics, weather forecasting, climate research, oil and gas exploration, molecular modeling (computing the structures and properties of chemical compounds, biological macromolecules, polymers, and crystals), and physical simulations (such as simulations of the early moments of the universe, airplane and spacecraft aerodynamics, the detonation of nuclear weapons, and nuclear fusion). Throughout their history, they have been essential in the field of cryptanalysis.

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Hardware
The word hardware in computing refers to the tangible physical parts of a computer system; its electrical, electronic, electromechanical and mechanical components.1 Cables, cabinets or boxes, peripherals of all kinds and any other physical element involved make up the hardware; conversely, software and intangible software is called software.