- A computer is an electronic machine, capable of performing basic operations like addition, subtraction, multiplication, division, etc.
- Abacus is the first known calculating machine used for counting.
- The Rotating Wheel Calculator was developed by Blaise Pascal, which is a predecessor to today’s electronic calculator.
- Charles Babbage is called as the father of today’s computer.
- The first generation of computers used vacuum tubes for circuitry and magnetic drums for memory.
- The second generation of computers witnessed the vacuum tubes being replaced by transistors.
- The third generation computer used the integrated circuits.
- The microprocessor brought forth the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip.
- Data is a collection of facts from which information may be derived.
- Information is a collection of facts from which conclusions may be drawn.
- Algorithm is defined as a step-by-step procedure or formula for solving a problem
- A computer program (or set of programs) is designed to systematically solve a problem.
- A computer system has two major components, hardware and software.
- The processing is performed by the hardware.
- Software refers to a program that makes the computer to do something meaningful and classified as System Software and Application Software
- System software consists of general programs written for a computer.
- An Application Software consists of programs designed to solve a user problem.
- Analog Computer is a computing device that works on continuous range of values.
- A digital computer operates on digital data such as numbers.
- A hybrid computing system is a combination of desirable features of analog and digital computers.
- Super computers process billions of instructions per second.
- Mainframes are capable of processing data at very high speeds – hundreds of million instructions per second.
- The mini computers were developed with the objective of bringing out low cost computers.
- The invention of microprocessor (single chip CPU) gave birth to the micro computers.
- The micro computers are further classified into workstation, personal computers, laptop computers and still smaller computers.
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