What does a computer full form?The word 'computer' comes from the Greek word Komputer meaning 'to count'. In order to count something, you need a counting device. Computers are electronic devices that allow us to count or calculate numbers. They are also called information processing machines.A computer is a machine that performs calculations using a series of instructions stored in memory. This means computers are capable of performing complex tasks such as writing letters, playing games, creating art, and even flying planes.COMPUTER stands for Common Operating Machine Purposely Used for Technological and Educational Research. It is only a myth because, first, this definition is absurd, and second, the original computers were merely calculating devices that required a lot of space to set up.COMPUTER = Arithmetical Logical Unit (ALU) + Control Unit (CU) Arithmetical Logical UnitThe component of a central processing unit known as an arithmetic-logic unit performs arithmetic and logic operations on the operands in computer instruction words.The ALU in certain processors is split into an arithmetic unit (AU) and a logic unit (LU). One AU may be for fixed-point operations while another may be for floating-point operations in some CPUs.Control UnitThe central processing unit includes the control unit (CPU). The control unit and arithmetic logic unit make up the central processing unit (CPU). The control unit creates the timing and control signals necessary for all computer activities. Utilizing the control unit's timing signals, data flow between the CPU, memory, and other peripherals is managed.Categorization of Computer- Analog Computer- Digital Computer- Hybrid ComputerCommon Types of Computer- Desktop ComputerA desktop computer is a type of personal computer (PC) designed to be placed on a desk or countertop. A desktop PC is characterized by having a display monitor as its primary user interface, along with a keyboard and mouse. In contrast to a laptop computer, a desktop computer does not have a built-in battery; instead, it connects to AC power using an external power supply unit.- Laptop ComputerThe term 'laptop' was originally coined by Apple Inc. in 1984 when they introduced their first portable Macintosh computer called the Macintosh Portable. Since then, laptops have become increasingly popular due to their portability and ease of use. Today's laptops are much smaller than early models, often measuring just over 11 inches tall by 6.5 inches wide. Popular laptop brands include Dell, HP, Lenovo, Acer, Asus, Toshiba, Samsung, and many others.- TabletsTablet computers are small, lightweight devices that run on batteries rather than mains electricity. Unlike smartphones, tablets do not need to connect to a network to access the internet. Instead, the tablet runs software that provides users with access to apps that perform specific tasks. Tablets are commonly used for reading books, playing games, watching videos, listening to music, taking notes, browsing the web, and performing basic word processing. Most tablets have touchscreens, although some lack them.- SmartphoneThe smartphone is a mobile phone with advanced features including Internet connectivity, voice recognition, text messaging, camera, GPS navigation system, digital compass, accelerometer, proximity sensors, and Bluetooth technology. The iPhone is the best-known brand of a smartphone today, followed by Android phones, Blackberry, Nokia, Windows Phone, and Symbian OS.- Mobile PhoneMobile phones are cellular telephones that can make and receive calls across a wireless communication network. Cellular networks were initially constructed and owned by telephone companies. As of 2017, there are around 2.8 billion active global subscribers, making it the world's largest telecommunications industry. Mobile phones have evolved significantly since their inception, becoming lighter, thinner, and more durable while providing enhanced functionality and supporting various technologies.- SmartwatchSmartwatches combine a wrist watch face with a functional PDA. Smartwatches are wearable computing devices that integrate mobile device features such as a touchscreen, speakers, cameras, location services, and fitness tracking capabilities into a single integrated product. Modern smartwatches provide notifications of incoming calls and messages, allow users to respond via short replies, and may provide navigational directions. Users can download third party applications to extend functionality.- Wearable DeviceWearable devices are electronic devices worn on the body, such as a headband or glasses. They are similar to smartphones in that they offer many of the same features, but are intended to be worn on the body. Wearable devices are gaining popularity among consumers and businesses alike. Many wearables are being used for medical purposes.