A computer is a machine that manipulates data according to a list of instructions.
There are a lot of terms can be found over the internet related to computer. All type of computer have processor, Memory, keyboard, mouse and screen to display output. But their is a significant difference how people or organizations use computes for their usage. We can divide all type of computers to 10 categories.
Personal Computer (PC) : A personal computer (PC) is a computer whose original sales price, size, and capabilities make it useful for individuals, and intended to be operated directly by an end user, with no intervening computer operator. People generally relate this term with Microsoft’s Windows Operating system. Personal computers generally run on Windows, Mac or some version of Linux operating system.
Desktop: Desktop computer is just another version of Personal Computer intended for regular use from a single use. A computer that can be fit on a desk can also be called as desktop. Desktop computers comes in different form vertical tower cases to small form factor. For more information please visit desktop at Lenovo.com
Laptop: Laptop computer , Laptop or Notebook all are same. Laptop’s are generally small mobile computers run on a single main battery or from an external power supply that will served as to run the laptop as well as charge the battery. Laptop contains all the components of computer but all these are optimized for mobile users.
Personal Digital Assistants(PDAs): A personal digital assistant (PDA) is a handheld computer, also known as small or palmtop computers. Newer PDAs also have both color screens and audio capabilities, enabling them to be used as mobile phones (smartphones), web browsers, or portable media players. Many PDAs can access the Internet, intranets or extranets via Wi-Fi, or Wireless Wide-Area Networks (WWANs). Many PDAs employ touch screen technology.
Workstation: A computer that has a more power resources like Processing Power, Memory and additional capabilities to perform special task refers to as workstation. Workstations are often optimized for displaying and manipulating complex data such as 3D mechanical design, engineering simulation results such as for computational fluid dynamics, animation and rendering of images, and mathematical plots.
Server: A server computer is a computer dedicated to running a server application. A server application is a computer program that accepts connections in order to service requests by sending back responses. Examples of server applications include web servers, e-mail servers, database servers, and file servers.
Mainframe: In early days of computing Mainframes are big computers that can fill the entire room or entire floor. Mainframes are mainly used by large organizations for critical applications, such as consumer statistics, ERP, and financial transaction processing.
Minicomputer: Minicomputers are lie between the Mainframe computer and small Personal Computers. Minicomputers also refereed to Mid-Range Servers. Minicomputers are more powerful but still compatible version of a personal computer.
Supercomputer: A computer which, among existing general-purpose computers at any given time, is superlative, often in several senses: highest computation rate, largest memory, or highest cost. Predominantly, the term refers to the fastest “number crunchers,” that is, machines designed to perform numerical calculations at the highest speed that the latest electronic device technology and the state of the art of computer architecture allow.
Wearable : Wearable computers are computers that are worn on the body. They have been applied to areas such as behavioral modeling, health monitoring systems, information technologies and media development. Government organizations, military, and health professionals have all incorporated wearable computers into their daily operations. Wearable computers are especially useful for applications that require computational support while the user’s hands, voice, eyes or attention are actively engaged with the physical environment.