We explain what a computer is, the elements that compose it and its invention. In addition, how it evolved and its different parts.


  1. What Is Computer?
  2. Hardware
  3. Output Devices
  4. Input Devices
  5. Software
  6. System Software
  7. Application Software
  8. Computer Antivirus
  9. Computer Hardware and Software
  10. Hardware And Software (Short Note)
  11. Data
  12. Database
  13. Information System
  14. WWW
  15. HTTP
  16. URL
  17. ISP
  18. FTP
  19. ADSL
  20. Domain On The Internet
  21. Office Automation
  22. Operative System
  23. Spreadsheet
  24. MS Excel
  25. MS Word
  26. PowerPoint
  27. Slide
  28. Multimedia
  29. Computer program
  30. Spyware
  31. Malware

What is a computer?

A computer, computer is  an electronic functioning machine , capable of processing data at high speed and in large quantities, converting them into useful information that will then be represented in convenient terms (analysable, understandable) by an operator or human user.

Computers are the most versatile and common tools of our time, and are manufactured from numerous integrated circuits , support components and extensions, which are operated under the coordination of a program called  the operating system  (OS).

Normally they receive and emit information through different mechanisms and protocols , whether they are used alone, or that they are intercommunicated through a network

very computer is composed of a vast amount of elements, grouped into two broad categories:  hardware  and  software

  • Hardware . It is the physical part of the computer, that is, its electronic physical components, intended for various functions, from information management to power supply and base calculations. It would be equivalent to the “body” of the device.
  • Software . This is the intangible, digital part of the computer, where all operations of conceptual or abstract type occur, and which normally operate in a simulated virtual environment: in a representation. The software is made up of the programs, both the basic ones (SO) and the applications subsequently installed. It would be equivalent to the “spirit” of the apparatus.

Few are the areas of life in the 21st century that do not use these machines for their organization and operation. Even everyday technological devices such as cell phones, calculators or the microwave oven consist of some type of computer.

  1. Who invented the computer?

IBM First Computer
The first industrial-scale computer was developed in 1953 and was the IBM650.

The invention of the computer can not be attributed to a particular individual, not even to a set of them at a certain time, but is the result of the needs of automation of the information of the human being . For its initial development, many previous advances were needed in the areas of electronics, electricity, mechanics, semiconductors, logic, algebra and programming.

The first computer recognizable as such was invented in 1938 by the German engineer Konrad Kuse and operated on the basis of perforated tapes. It was called Z1 and it was the first model of the first autonomous computer, the Z3, which were basically programmable electromechanical calculators.

The first industrial-scale computer was developed in 1953 and was the IBM650 . The first personal computer sold on a large scale would appear in 1977: the Apple II, of the newly created North American corporation of Steve Jobs.

  1. Evolution of the computer

The first predecessors of the computer were primitive and ancient tools that allowed to facilitate the work of calculation, say, grandparents of school calculators like the abacus (invented in 2700 BC).

The development of mathematics and the invention of algorithms (830 AD) or the rules of calculation (1620 AD) would be the conceptual basis for a long scientific evolution that would crystallize in the 19th century, with the invention of the first calculating machines , such as the “analytical machine” of Charles Babbage (1833) or the tabulating machine of Hermann Hollerith (1890).

The next step occurs in the  Second World War , when the mathematician Alan Turing, among others, collaborated to develop automatic systems that decipher the German military codes . At the same time, on the other side, the Z1 and its later versions were invented, which due to the  war  would go largely unnoticed.

The first generation of computers appeared in the 1950s and were nothing more than bulky calculating machines, which consisted of transistors and control programs based on punched cards.

Its replacement by valve systems that same decade led to the birth of the second generation, and the third generation came from the invention in 1957 of integrated circuits, thanks to which would originate the processor and microprocessor in 1971

From then on, the evolution of the computer would be dizzying, with the first portable computers and the first PDAs appearing in 2000, and in 2007 the iPhone , the first smart cell phone or  martphone

  1. Computer parts

Peripherals exchange information between the computer system and the outside.

Commonly, a computer is composed of three parts:

  • CPU . Acronym of  Central Processing Unit  ( Central  Processing Unit ), is the “brain” of the computer, where all the logical operations are carried out and there are the microprocessors, as well as the fixed memory and storage units, known as “disks” rigid “or” hard drives “. The CPU also comprises an ALU (Arithmetic-Logical Unit), a UC (Control Unit) and a series of data or registers. 
  • Primary memory . Known as Random  Access Memory ( RAM :  Random Access  Memory ), it is a sequence of storage cells that is temporarily occupied by the calculations necessary for the operation of the computer. This memory can be rewritten thousands of times, unlike its read only companion ( ROM :  Read Only Memory ) that is already registered at the factory.  
  • Peripherals . This is the name of the non-central components of the computer that allow the entry and exit of information, that is, the exchange between the computer system and the outside, including, of course, the operator or user .
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