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Classified ads   are ads that are published in the written press ( newspapers or magazines ) and in digital media to offer and demand products and services. With the emergence of the Internet, digital techniques have been developed and professionalized, relegating the printed press to a second place in classified ads (this is the case of the Segundamano classified newspaper, which after 30 years of publication was closed, leaving only its online version).   [  1  ]  The vast majority of these digital publications are free for users to have lower costs of maintaining their infrastructure compared to print media. For the most part, publications on classified ad sites are free, but at a minimal cost  - depending on the site -  if the ad is to be highlighted. The cost increases depending on website traffic.   UK free ads  here On the Internet, classified ads have acquired a new perspective;   people...

Concept of COMPUTER 1.      What is a computer ? A computer, computer or 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.       (SW). Normally they receive and emit information through different mechanisms and protocols , whether they are used alone, or that they are intercommunicated through a network . Every computer is composed of a vast amount of elements, grouped into two broad categories:  hardware  and  s...