A type of computer designed to fit comfortably on top of a desk, typically with the monitor sitting on top of the system unit.
Desktop model computers are wide and short, while tower model computers are narrow and tall.
Due to their shape, desktop model computers are generally limited to three internal mass storage devices.
Desktop models designed to be very small are sometimes referred to as slimline models.
A small, portable computer small enough that it can sit on your lap.
Today, computer laptops are more commonly referred to as notebook computers, but technically laptops are slightly larger in size than notebooks in both thickness and weight.
Tablet is a type of notebook computer that has an LCD screen on which the use can write using fingerhand swipe actions or by using a special-purpose pen,or stylus.
Unlike desktop computers, all user input is done directly on the tablet’s LCD screen.
Hand writing is digitized on a tablet computer and can be converted to standard text using handwriting recognition, or left as handwritten text. You can also use the stylus to type on a pen-based key layout.
In this ce lettered keys are arranged differently than the QWERTY keyboard.
Tablet PCs can be equipped with a keyoard and/or a mouse for input.
Based on digital ink technology, the tablet PC places a digitizer below or above an LCD screen to detect the movement of a special pen and generate an electromagnetic field that can capture the movement of the special-purpose pen and record the movement on the LCD screen.
The effect is like writing on paper with liquid ink.
Smartphones are a handheld device that integrates mobile phone capabilities with the more common features of a handheld computer or PDA.
Smartphones allow users to store information, send e-mails, install programs, along with using a mobile phone in one device.
For example, a smartphone could be a mobile phone with some PDA features built into the device, or vice versa.
An operating system (OS) is a software that allows a user to run other applications on a computing device.
The operating system manages a computer's software and hardware resources, including:
1. Input devices such as a keyboard and mouse.
2. Output devices such as display monitors, printers, and scanners.
3. Network devices such as modems, routers, and network connections.
4. Storage devices such as internal and external drives.
The OS also provides services to facilitate the efficient execution, management, and memory allocations for any additional installed software application programs.
Multi-user: Allows two or more users to run programs at the same time.
Multiprocessing: Supports running a program on more than one CPU.
Multitasking: Allows more than one program to run concurrently.
Multithreading: Allows different parts of a single program to run concurrently.
Real time: Responds to input instantly.
General-purpose operating systems, suchas DOS and UNIX, are not real-time.
Microsoft Windows is a family of operating systems for personal and business computers. Windows dominates the personal computer world, providing graphical user interfaces (GUI), virtual memory management, multitasking, and support for many peripheral devices.
Mac OS is the official name of the Apple Macintosh operating system. Mac OS features a graphical user interface (GUI) that utilizes windows, icons, and allapplications running on a Macintosh computer have a similar user interface.
According to Netmarketshare.com, the most used desktop operating system and versions used on PCs (desktops and laptops) from January to November, 2019 are:
Windows 87.40%
Mac OS 10.06%
Linux 1.95%
Chrome OS 0.39%
Unknown 0.20%
BSD 0.01%
In the same way that a desktop operating system controls your desktop or laptop computer, mobile operating systems are designed specifically to run on mobile devices such as mobile phones, smartphones, PDAs, tablet computers andother handhelds.