HOW DO COMPUTERS WORK?

A computer is a machine that can be programmed with instructions. Computers receive information (input), they carry out a process and they produce output.
HISTORY OF COMPUTERS: The first computer was invented in 1943. It was used to break the codes used by the German army to send messages during World War II. It's name was Colossus because it occupied a whole room.

Ian Petticrew [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons

 In 1971, Intel produced the first microprocessor: a very small programmable device. The invention of the microprocessor led to the production of the first household computers.

By Jamo spingal (Own work) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons

 In the early 1980s, IBM and Apple began producing personal computers or PCs.

IBM PC 515, By Ruben de Rijcke (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

TYPES OF COMPUTERS:
General purpose machines: they can perform many functions: mobile phones...
Special purpose machines: they perform one specific function: GPS...