1.2 Categories Of Computers

Supercomputers

A supercomputer is the fastest, most powerful,  most expensive computer and used for very complex, sophisticated job such as nuclear research, calculating weather patterns, petroleum exploration, online banking, automotive design.The physical size is full room of equipment.The fastest supercomputer are capable of processing billions of program instructions per second.Can operate at speeds measured in picoseconds-1,000 times as fast as microcomputers.It can store more than 20,000 times the data and information of an average desktop computer.

Mainframes 

A mainframe is a large, expensive, powerful computer that can handle hundreds or thousands of connected users simultaneously (multi-user) and storing tremendous amounts of data, instructions and information.
Mainframes are often used in businesses that manage large amounts of data, for example, insurance companies use mainframes to process information about millions of policyholders.Its physical size is partial to a full room equipment.It is a powerful computer that handle hundreds or thousands of connected users simultaneously at the same time.It can store tremendous amounts of data, instructions, and information;
enterprises are able to bill millions of customers, prepare payroll for thousands of employees, and manage thousands of item in inventory.

Personal Computers

Personal computer is a computer that can perform all its input, processing, output and storage activities by itself.Two types of personal computers are desktop computers, and notebook computers.It fits on a desk.Its speed is various depending on processor and memory.Its storage is various depending on hard drive size.

Mobile Computers And Devices 

 Mobile computer is a personal computer that can perform the four basic activities by itself and you can carry it from place to place.Mobile device is small enough to hold in your hand.It fits on the lap,palm and pocket.It may be slower than a personal computer.It contains a small storage media.

Embedded Computer

A special-purpose computer that functiona as a component in a larger product and perform various functions depending on the product.It is small.It may be slower than a mobile computer and devices.Its storage is limited or small storage media.